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All questions of Electricity for Primary 6 Exam
The base of an electric cell is its ___________terminal.- a)Positive terminal
- b)Negative terminal
- c)Negative and positive
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The base of an electric cell is its ___________terminal.
a)
Positive terminal
b)
Negative terminal
c)
Negative and positive
d)
None of these
|
Varun Kapoor answered |
Metal cap is the positive terminal and the metal disc is the negative terminal of the electric cell. An electric cell produces electricity from the chemicals stored inside it.
Non metals like __________and __________are conductors of electricity- a)Wood and paper
- b)Graphite and gas carbon
- c)Glass and rubber
- d)None of theses
Correct answer is option 'B'. Can you explain this answer?
Non metals like __________and __________are conductors of electricity
a)
Wood and paper
b)
Graphite and gas carbon
c)
Glass and rubber
d)
None of theses
|
Ishan Choudhury answered |
Carbon is the only gas, when solidified, that can conduct electricity. This is of the form Graphite, when it only has 3 bonds between the atoms. This leaves electrons to flow through the network structure.
____________ is a device which converts chemical energy in to electrical energy.- a)Electrical bell
- b)Electric lift
- c)Electric cell
- d)Electric bulb
Correct answer is option 'C'. Can you explain this answer?
____________ is a device which converts chemical energy in to electrical energy.
a)
Electrical bell
b)
Electric lift
c)
Electric cell
d)
Electric bulb
|
|
Priyanshu Intelligent answered |
Off course Electric cell or EMF .Since all other options are
Kerosene oil is an example of _______________.- a)Conductors
- b)Insulators
- c)Electrolyte
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
Kerosene oil is an example of _______________.
a)
Conductors
b)
Insulators
c)
Electrolyte
d)
None of these
|
Arjun Desai answered |
Petrol and kerosene oil have very low electrical conductivity and hence they are poor electrical conductors (i.e. insulators).
The unit of electric current is:- a)Volt
- b)Ampere
- c)Ohm
- d)Joule
Correct answer is option 'B'. Can you explain this answer?
a)
Volt
b)
Ampere
c)
Ohm
d)
Joule
|
|
Shreyshi answered |
The unit of electric current is Ampere.
So, Option B is correct answer.
So, Option B is correct answer.
The tiny coiled metal wire present inside the bulb is called____________.- a)Element
- b)Conductor
- c)Filament
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
The tiny coiled metal wire present inside the bulb is called____________.
a)
Element
b)
Conductor
c)
Filament
d)
None of these
|
Manasa Chauhan answered |
An incandescent light bulb has a small thin wire with two bigger wires holding it up. This wire is called a filament. The filament is the part of the light bulb that produces light. Filaments in incandescent light bulbs are made of tungsten.
A combination of two or more electric cells is called___________.- a)Electric circuit
- b)Battery
- c)Terminals
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
A combination of two or more electric cells is called___________.
a)
Electric circuit
b)
Battery
c)
Terminals
d)
None of these
|
Gayatri Chavan answered |
Battery. It is a collection of cells whose chemical reactions result in the flow of multiple electrons in circuits. Each battery consists of a positive side called the cathode and a negative side called the anode.
Also, it contains a unique electrolyte. When the battery is connected to power, chemical reactions take place somewhere between the electrolyte and anode.
A device that is used to break an electric circuit is called
- a)Earth wire
- b)Switch
- c)Live wire
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
A device that is used to break an electric circuit is called
a)
Earth wire
b)
Switch
c)
Live wire
d)
None of these
|
Kunal Mehta answered |
A device that is used to break an electric circuit is called switch.
In _____________ electrical energy is transformed in to mechanical energy.- a)Transistor
- b)Mixer grinder
- c)Electromagnet
- d)Electric bell.
Correct answer is option 'B'. Can you explain this answer?
In _____________ electrical energy is transformed in to mechanical energy.
a)
Transistor
b)
Mixer grinder
c)
Electromagnet
d)
Electric bell.
|
Priyanka Sharma answered |
As the electrical energy is used to run blades in the mixer grinder and hence we say in mixer grinder electrical energy is transformed into mechanical energy(rotation of blades).
In an electric circuit, which device is used to measure the current?- a)Voltmeter
- b)Ammeter
- c)Galvanometer
- d)Resistor
Correct answer is option 'B'. Can you explain this answer?
In an electric circuit, which device is used to measure the current?
a)
Voltmeter
b)
Ammeter
c)
Galvanometer
d)
Resistor
|
Rainbow Rise Classes answered |
An ammeter is used to measure electric current in a circuit. It is connected in series with the components to measure the current flowing through them.
------------- is an energy which flows in an electric circuit.- a)Electric circuit
- b)Electromagnet
- c)Electric current
- d)None of these.
Correct answer is option 'C'. Can you explain this answer?
------------- is an energy which flows in an electric circuit.
a)
Electric circuit
b)
Electromagnet
c)
Electric current
d)
None of these.
|
Harshitha Mukherjee answered |
An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma).
Which of the following is NOT a function of an electric cell?- a)Providing a power source for portable devices
- b)Acting as a conductor of electricity
- c)Storing chemical energy to be converted into electrical energy
- d)Powering devices like wristwatches and radios
Correct answer is option 'B'. Can you explain this answer?
a)
Providing a power source for portable devices
b)
Acting as a conductor of electricity
c)
Storing chemical energy to be converted into electrical energy
d)
Powering devices like wristwatches and radios
|
Gunjan Lakhani answered |
An electric cell does not act as a conductor of electricity; rather, it serves as a power source by converting stored chemical energy into electrical energy. Conductors are materials that allow electricity to flow through them, which is different from the function of an electric cell.
A complete electric circuit is called ______________ electric circuit.- a)open
- b)Closed
- c)Complete
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
A complete electric circuit is called ______________ electric circuit.
a)
open
b)
Closed
c)
Complete
d)
None of these
|
Lavanya Menon answered |
Closed circuit means a complete electrical connection around which current flows or circulates.
__________is a conductor.- a)Wood
- b)Metal
- c)Paper
- d)Petrol
Correct answer is option 'B'. Can you explain this answer?
__________is a conductor.
a)
Wood
b)
Metal
c)
Paper
d)
Petrol
|
|
Darshan Patel answered |
Conductor:
- A conductor is a material that allows the flow of electric current through it.
- It is characterized by its ability to conduct heat and electricity.
- Conductors have high electrical conductivity.
- They have free electrons that can move easily through the material.
- The flow of electrons constitutes an electric current.
- Conductors are used in various electrical and electronic devices to carry and transmit electricity.
- Examples of common conductors include metals such as copper, aluminum, and silver.
- These metals have high electrical conductivity due to the presence of loosely bound electrons.
- Among the given options, metal (option B) is the only material that is a conductor.
- Wood (option A), paper (option C), and petrol (option D) are not conductors of electricity.
- Wood and paper are insulators, while petrol is a non-conductive liquid.
- Therefore, the correct answer is option B: Metal.
- A conductor is a material that allows the flow of electric current through it.
- It is characterized by its ability to conduct heat and electricity.
- Conductors have high electrical conductivity.
- They have free electrons that can move easily through the material.
- The flow of electrons constitutes an electric current.
- Conductors are used in various electrical and electronic devices to carry and transmit electricity.
- Examples of common conductors include metals such as copper, aluminum, and silver.
- These metals have high electrical conductivity due to the presence of loosely bound electrons.
- Among the given options, metal (option B) is the only material that is a conductor.
- Wood (option A), paper (option C), and petrol (option D) are not conductors of electricity.
- Wood and paper are insulators, while petrol is a non-conductive liquid.
- Therefore, the correct answer is option B: Metal.
When a wire carrying current is wound into a coil around an iron nail, it acts as a temporary magnet. What is this temporary magnet called?- a)Permanent magnet
- b)Temporary magnet
- c)Electromagnet
- d)Magnetized coil
Correct answer is option 'C'. Can you explain this answer?
When a wire carrying current is wound into a coil around an iron nail, it acts as a temporary magnet. What is this temporary magnet called?
a)
Permanent magnet
b)
Temporary magnet
c)
Electromagnet
d)
Magnetized coil
|
|
Rainbow Rise Classes answered |
A coil of wire around an iron core that becomes magnetic when current flows through it is known as an electromagnet.
What material is used to make the filament in a torch bulb?- a)Aluminium
- b)Plastic
- c)Tungsten
- d)Copper
Correct answer is option 'C'. Can you explain this answer?
a)
Aluminium
b)
Plastic
c)
Tungsten
d)
Copper
|
Rahul Kumar answered |
The filament of a torch bulb is made of tungsten. Tungsten is used because it has a high melting point, allowing it to glow brightly without melting when electricity passes through it. This makes it ideal for producing light in incandescent bulbs.
A material which does not allow the electricity to pass through it is___________.- a)Conductor
- b)Electric cell
- c)Insulator
- d)None of these.
Correct answer is option 'C'. Can you explain this answer?
A material which does not allow the electricity to pass through it is___________.
a)
Conductor
b)
Electric cell
c)
Insulator
d)
None of these.
|
Moumita Roy answered |
An electrical insulator is a material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field.
A material which allows the electricity to pass through it is ________.- a)conductor
- b)Insulator
- c)Transistor
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
A material which allows the electricity to pass through it is ________.
a)
conductor
b)
Insulator
c)
Transistor
d)
None of these
|
Anita Menon answered |
Conductors are the materials or substances which allow electricity to flow through them. They are able to conduct electricity because they allow electrons to flow inside them very easily.
----------- is the positive terminal of an electric cell.- a)Metal disc
- b)Metal case
- c)Metal cap
- d)Metal base
Correct answer is option 'C'. Can you explain this answer?
----------- is the positive terminal of an electric cell.
a)
Metal disc
b)
Metal case
c)
Metal cap
d)
Metal base
|
|
Harshitha Mukherjee answered |
The electric cell has two terminals: a positive terminal and negative terminal. The metal cap is positive terminal of the electric cell whereas metal disc is the negative terminal of the electric cell.
How does a closed electric circuit ensure that a bulb lights up?- a)By allowing the bulb to bypass the electric cell
- b)By connecting both terminals of the electric cell to each other directly
- c)By providing a continuous path for current to flow through the bulb
- d)By using a switch to open and close the circuit
Correct answer is option 'C'. Can you explain this answer?
a)
By allowing the bulb to bypass the electric cell
b)
By connecting both terminals of the electric cell to each other directly
c)
By providing a continuous path for current to flow through the bulb
d)
By using a switch to open and close the circuit
|
EduRev Class 6 answered |
A closed electric circuit provides a continuous path for the electric current to flow from one terminal of the electric cell to the other terminal through the bulb. This flow of current through the filament of the bulb makes it glow.
Electric energy is produced from the____________ within the cell.- a)Chemicals
- b)Metals
- c)Terminals
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Electric energy is produced from the____________ within the cell.
a)
Chemicals
b)
Metals
c)
Terminals
d)
None of these
|
Geetika Shah answered |
In simple cell battery converts chemical energy into electricity. The chemical reaction produces electrons, which then collect at the negative terminal of the battery. When there is a connection between the positive and negative terminal, the electrons flow to the positive terminal.
----------- is an insulator.- a)Metal
- b)acid
- c)Rubber
- d)Salt solution
Correct answer is option 'C'. Can you explain this answer?
----------- is an insulator.
a)
Metal
b)
acid
c)
Rubber
d)
Salt solution
|
|
Nishu💞 answered |
C...as electricity can't pass through rubber.
What is the purpose of a switch in an electric circuit?- a)To increase the voltage in the circuit
- b)To control the flow of electricity by opening or closing the circuit
- c)To store electrical energy
- d)To convert electrical energy into light energy
Correct answer is option 'B'. Can you explain this answer?
a)
To increase the voltage in the circuit
b)
To control the flow of electricity by opening or closing the circuit
c)
To store electrical energy
d)
To convert electrical energy into light energy
|
Dr Manju Sen answered |
A switch controls the flow of electricity in a circuit by either opening (breaking) or closing (completing) the circuit. This allows you to turn electrical devices on or off as needed.
Which component in an electric circuit is represented by a longer line (positive terminal) and a shorter, thicker line (negative terminal)?- a)Switch
- b)Battery
- c)Electric cell
- d)Bulb
Correct answer is option 'C'. Can you explain this answer?
Which component in an electric circuit is represented by a longer line (positive terminal) and a shorter, thicker line (negative terminal)?
a)
Switch
b)
Battery
c)
Electric cell
d)
Bulb
|
|
Rainbow Rise Classes answered |
An electric cell is depicted by a longer line for the positive terminal and a shorter, thicker line for the negative terminal in circuit diagrams.
Why should you never connect the two terminals of an electric cell directly?- a)It could cause the cell to explode
- b)It will deplete the cell quickly and cause it to stop working
- c)It will increase the voltage in the circuit
- d)It will make the cell produce light
Correct answer is option 'B'. Can you explain this answer?
a)
It could cause the cell to explode
b)
It will deplete the cell quickly and cause it to stop working
c)
It will increase the voltage in the circuit
d)
It will make the cell produce light
|
Torcia Education answered |
Connecting the two terminals of an electric cell directly without a proper circuit can cause the chemicals inside the cell to be used up rapidly, leading to the cell's quick depletion. This is because a direct connection creates a short circuit, which is harmful to the cell's longevity.
What is the function of a battery in an electric circuit?- a)To store electricity
- b)To reduce voltage
- c)To increase resistance
- d)To generate magnetic fields
Correct answer is option 'A'. Can you explain this answer?
What is the function of a battery in an electric circuit?
a)
To store electricity
b)
To reduce voltage
c)
To increase resistance
d)
To generate magnetic fields
|
|
Rainbow Rise Classes answered |
A battery stores chemical energy and releases it as electrical energy, providing power to various devices in the circuit.
Which of the following materials will not conduct electric current?- a)Copper
- b)Aluminium
- c)Plastic
- d)Iron
Correct answer is option 'C'. Can you explain this answer?
Which of the following materials will not conduct electric current?
a)
Copper
b)
Aluminium
c)
Plastic
d)
Iron
|
Coachify answered |
Plastic is an insulator and does not conduct electricity, unlike copper, aluminum, and iron, which are conductors.
Why does an electric bulb glow in a circuit?- a)Because there is no electricity in the circuit
- b)Because the circuit provides a path for electricity to flow
- c)Because the bulb is broken
- d)Because the wires are not connected properly
Correct answer is option 'B'. Can you explain this answer?
Why does an electric bulb glow in a circuit?
a)
Because there is no electricity in the circuit
b)
Because the circuit provides a path for electricity to flow
c)
Because the bulb is broken
d)
Because the wires are not connected properly
|
|
Torcia Education answered |
An electric bulb glows in a circuit because the circuit gives a way for electricity to move through it. This flow of electricity through the bulb's filament makes it light up. So when the circuit is complete and the current can pass through, the bulb will glow.
How can you determine if a material is a conductor or an insulator using a simple circuit?- a)By checking if the material is shiny
- b)By observing if the bulb glows when the material is included in the circuit
- c)By measuring the length of the material
- d)By noting the color of the material
Correct answer is option 'B'. Can you explain this answer?
a)
By checking if the material is shiny
b)
By observing if the bulb glows when the material is included in the circuit
c)
By measuring the length of the material
d)
By noting the color of the material
|
Aditya Menon answered |
Observing the Bulb Glow to Determine if a Material is a Conductor or an Insulator
Conductors and insulators are two types of materials that have different abilities to allow the flow of electricity. A simple circuit can be used to determine if a material is a conductor or an insulator. Here's how you can do it:
Setting up the Circuit
- Create a simple circuit with a battery, wires, and a bulb.
- Make sure the circuit is complete and the bulb is glowing when the circuit is closed.
Testing the Material
- Insert the material you want to test into the circuit.
- If the bulb continues to glow brightly, then the material is a conductor. Conductors allow electricity to flow through them easily.
- If the bulb does not light up or glows dimly, then the material is an insulator. Insulators do not allow electricity to flow through them easily.
Explanation
- When the material is included in the circuit, it either allows the flow of electricity (conductor) or blocks the flow of electricity (insulator).
- Conductors have free electrons that can move easily, allowing electricity to flow through them. This is why the bulb continues to glow when a conductor is included in the circuit.
- Insulators, on the other hand, do not have free electrons that can move easily. This prevents the flow of electricity, resulting in the bulb not lighting up or glowing dimly when an insulator is included in the circuit.
By observing the behavior of the bulb in the circuit with the material, you can determine if the material is a conductor or an insulator.
Conductors and insulators are two types of materials that have different abilities to allow the flow of electricity. A simple circuit can be used to determine if a material is a conductor or an insulator. Here's how you can do it:
Setting up the Circuit
- Create a simple circuit with a battery, wires, and a bulb.
- Make sure the circuit is complete and the bulb is glowing when the circuit is closed.
Testing the Material
- Insert the material you want to test into the circuit.
- If the bulb continues to glow brightly, then the material is a conductor. Conductors allow electricity to flow through them easily.
- If the bulb does not light up or glows dimly, then the material is an insulator. Insulators do not allow electricity to flow through them easily.
Explanation
- When the material is included in the circuit, it either allows the flow of electricity (conductor) or blocks the flow of electricity (insulator).
- Conductors have free electrons that can move easily, allowing electricity to flow through them. This is why the bulb continues to glow when a conductor is included in the circuit.
- Insulators, on the other hand, do not have free electrons that can move easily. This prevents the flow of electricity, resulting in the bulb not lighting up or glowing dimly when an insulator is included in the circuit.
By observing the behavior of the bulb in the circuit with the material, you can determine if the material is a conductor or an insulator.
_______ is an electric device which easily closes or opens an electric circuit.
- a)Filament
- b)Electric bulb
- c)Electric switch
- d)Electric cell
Correct answer is option 'C'. Can you explain this answer?
_______ is an electric device which easily closes or opens an electric circuit.
a)
Filament
b)
Electric bulb
c)
Electric switch
d)
Electric cell
|
|
Gayatri Chavan answered |
The correct answer is option 'C' (Electric switch) An electric switch is an electric device that easily closes or opens an electric circuit. When a switch is closed, it completes the circuit and allows electricity to flow through it, whereas when a switch is open, it breaks the circuit and stops the flow of electricity. Electric switches come in many different forms and are used to control the flow of electricity in a wide range of applications.
Which of these is NOT an example of an appliance using the heating effect of electric current?- a)Hairdryer
- b)Toaster
- c)LED bulb
- d)Electric room heater
Correct answer is option 'C'. Can you explain this answer?
Which of these is NOT an example of an appliance using the heating effect of electric current?
a)
Hairdryer
b)
Toaster
c)
LED bulb
d)
Electric room heater
|
Vp Classes answered |
LED bulbs use electroluminescence to produce light without generating significant heat, unlike devices like hairdryers or toasters that use heating elements.
Which of these appliances does NOT use the heating effect of electric current?- a)Electric iron
- b)Electric kettle
- c)Refrigerator
- d)Toaster
Correct answer is option 'C'. Can you explain this answer?
a)
Electric iron
b)
Electric kettle
c)
Refrigerator
d)
Toaster
|
Rajveer Banerjee answered |
Understanding the Heating Effect of Electric Current
The heating effect of electric current refers to the phenomenon where electrical energy is converted into heat when current flows through a conductor. This effect is utilized in various appliances, but not all appliances exploit this principle.
Appliances Using Heating Effect
- Electric Iron:
Electric irons generate heat through the resistance of the heating element when electric current passes through. This heat is used to press clothes.
- Electric Kettle:
An electric kettle heats water by converting electrical energy into heat using a heating element. This is a direct application of the heating effect of electric current.
- Toaster:
Toasters use the heating effect to brown bread. When electricity flows through the metal wires inside, they get hot enough to toast the bread.
Appliance Not Using Heating Effect
- Refrigerator:
Refrigerators operate on a different principle. They use a refrigeration cycle involving compressors and refrigerants to remove heat from the inside of the appliance, keeping it cool. While they use electricity, they do not rely on the heating effect to function.
Conclusion
In summary, among the listed appliances, the refrigerator is the only one that does not utilize the heating effect of electric current, making option 'C' the correct answer.
The heating effect of electric current refers to the phenomenon where electrical energy is converted into heat when current flows through a conductor. This effect is utilized in various appliances, but not all appliances exploit this principle.
Appliances Using Heating Effect
- Electric Iron:
Electric irons generate heat through the resistance of the heating element when electric current passes through. This heat is used to press clothes.
- Electric Kettle:
An electric kettle heats water by converting electrical energy into heat using a heating element. This is a direct application of the heating effect of electric current.
- Toaster:
Toasters use the heating effect to brown bread. When electricity flows through the metal wires inside, they get hot enough to toast the bread.
Appliance Not Using Heating Effect
- Refrigerator:
Refrigerators operate on a different principle. They use a refrigeration cycle involving compressors and refrigerants to remove heat from the inside of the appliance, keeping it cool. While they use electricity, they do not rely on the heating effect to function.
Conclusion
In summary, among the listed appliances, the refrigerator is the only one that does not utilize the heating effect of electric current, making option 'C' the correct answer.
Bulb glows only in- a)open circuit
- b)closed circuit
- c)in both circuits
- d)open circuit if bulb is not fused
Correct answer is option 'B'. Can you explain this answer?
Bulb glows only in
a)
open circuit
b)
closed circuit
c)
in both circuits
d)
open circuit if bulb is not fused
|
Nilotpal Nambiar answered |
Only a closed circuit is a complete circuit.
What happens to the current in a parallel circuit when one path is broken?- a)The entire circuit stops working
- b)Current increases
- c)Current decreases
- d)Current continues through other paths
Correct answer is option 'D'. Can you explain this answer?
What happens to the current in a parallel circuit when one path is broken?
a)
The entire circuit stops working
b)
Current increases
c)
Current decreases
d)
Current continues through other paths
|
|
EduRev Class 6 answered |
In a parallel circuit, each path operates independently. If one path is broken:
- The current continues to flow through the remaining paths.
- This means that other devices connected in parallel will still function.
- Only the broken path will stop conducting electricity.
This characteristic of parallel circuits ensures reliability, as the failure of one component does not disrupt the entire system.
A bulb has- a)two terminals and two filaments
- b)two terminals and one filament
- c)multiple terminals and single filament
- d)single terminal and single filament
Correct answer is option 'B'. Can you explain this answer?
A bulb has
a)
two terminals and two filaments
b)
two terminals and one filament
c)
multiple terminals and single filament
d)
single terminal and single filament
|
EduRev UPSC answered |
A bulb has a filament which glows and two terminals which are joined to two terminals of the battery.
The path along which electric current flows is_____________.- a)Switch
- b)Electric current
- c)Electric circuit
- d)Electric cell
Correct answer is option 'C'. Can you explain this answer?
The path along which electric current flows is_____________.
a)
Switch
b)
Electric current
c)
Electric circuit
d)
Electric cell
|
|
Muskaan Choudhury answered |
The path along which electric current flows is an electric circuit.
An electric circuit is a closed loop through which electric current can flow. It consists of various components such as wires, switches, resistors, capacitors, and more, that are connected in a specific arrangement. These components work together to allow the flow of electric current.
Components of an Electric Circuit:
1. Power Source: An electric circuit requires a power source to provide the energy for the flow of electric current. The most common power source in a circuit is an electric cell or battery.
2. Conducting Wires: Wires act as pathways for the movement of electric charge. They are made of conductive materials such as copper or aluminum, which allow electric current to flow easily.
3. Switches: Switches are devices that can be opened or closed to control the flow of electric current. When a switch is closed, the circuit is complete, and current can flow. When a switch is open, the circuit is broken, and current cannot flow.
4. Load or Load Resistor: The load is a device or component in the circuit that consumes electric energy. Examples of loads include light bulbs, motors, or any other electrical appliance.
5. Other Components: Depending on the complexity of the circuit, additional components such as resistors, capacitors, diodes, and transistors may be included to control the flow of current or modify the circuit's behavior.
Working of an Electric Circuit:
When a power source, such as an electric cell, is connected to a complete circuit, it creates a potential difference, which is the driving force for electric current. The potential difference pushes the electric charges in the circuit, causing them to flow from the positive terminal of the power source to the negative terminal.
The conducting wires provide a pathway for the electric charges to travel through. The switches control the flow of current by opening or closing the circuit. The load consumes the electric energy and converts it into other forms, such as light, heat, or mechanical energy.
Conclusion:
In conclusion, an electric circuit is the path along which electric current flows. It is made up of various components connected in a specific arrangement, including a power source, conducting wires, switches, and loads. Understanding electric circuits is essential in the study of electricity and electronics.
An electric circuit is a closed loop through which electric current can flow. It consists of various components such as wires, switches, resistors, capacitors, and more, that are connected in a specific arrangement. These components work together to allow the flow of electric current.
Components of an Electric Circuit:
1. Power Source: An electric circuit requires a power source to provide the energy for the flow of electric current. The most common power source in a circuit is an electric cell or battery.
2. Conducting Wires: Wires act as pathways for the movement of electric charge. They are made of conductive materials such as copper or aluminum, which allow electric current to flow easily.
3. Switches: Switches are devices that can be opened or closed to control the flow of electric current. When a switch is closed, the circuit is complete, and current can flow. When a switch is open, the circuit is broken, and current cannot flow.
4. Load or Load Resistor: The load is a device or component in the circuit that consumes electric energy. Examples of loads include light bulbs, motors, or any other electrical appliance.
5. Other Components: Depending on the complexity of the circuit, additional components such as resistors, capacitors, diodes, and transistors may be included to control the flow of current or modify the circuit's behavior.
Working of an Electric Circuit:
When a power source, such as an electric cell, is connected to a complete circuit, it creates a potential difference, which is the driving force for electric current. The potential difference pushes the electric charges in the circuit, causing them to flow from the positive terminal of the power source to the negative terminal.
The conducting wires provide a pathway for the electric charges to travel through. The switches control the flow of current by opening or closing the circuit. The load consumes the electric energy and converts it into other forms, such as light, heat, or mechanical energy.
Conclusion:
In conclusion, an electric circuit is the path along which electric current flows. It is made up of various components connected in a specific arrangement, including a power source, conducting wires, switches, and loads. Understanding electric circuits is essential in the study of electricity and electronics.
What is the primary purpose of an electric cell in a torch?- a)To convert electrical energy into light energy
- b)To store electrical energy for later use
- c)To provide electricity to the bulb in the torch
- d)To prevent electric shocks
Correct answer is option 'C'. Can you explain this answer?
a)
To convert electrical energy into light energy
b)
To store electrical energy for later use
c)
To provide electricity to the bulb in the torch
d)
To prevent electric shocks
|
|
Torcia Education answered |
An electric cell provides the electricity needed for the bulb in a torch to light up. It produces electricity through chemical reactions within it, which then flows through the circuit to illuminate the bulb. This fundamental component allows portable lighting devices like torches to function.
In electric bells, electric energy transforms into ____________ energy.- a)Mechanical energy
- b)Heat energy
- c)Sound energy
- d)Light energy
Correct answer is option 'C'. Can you explain this answer?
In electric bells, electric energy transforms into ____________ energy.
a)
Mechanical energy
b)
Heat energy
c)
Sound energy
d)
Light energy
|
Rohini Seth answered |
- In electric bells, electric energy is converted into sound energy.
- When the electric current passes through the coil, it creates a magnetic field that attracts a metal striker, causing it to hit a bell or gong, producing sound.
- Thus, the primary transformation of energy in an electric bell is from electrical to sound energy.
If a bulb does not light up when connected to a cell, which of the following could be the reason?- a)The bulb is made of glass
- b)The circuit is not complete
- c)The cell is overcharged
- d)The wires are too long
Correct answer is option 'B'. Can you explain this answer?
a)
The bulb is made of glass
b)
The circuit is not complete
c)
The cell is overcharged
d)
The wires are too long
|
|
Rahul Kumar answered |
If a bulb does not light up, it often means that the circuit is not complete. For the bulb to glow, the circuit must provide a continuous path for the electric current to flow through the bulb. If there is any break in this path, the bulb will not light up.
The electric current in a closed circuit always flows from the ___________terminal of the electric cell to the ______terminal.- a)Negative to positive
- b)Positive to negative
- c)Positive to positive
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The electric current in a closed circuit always flows from the ___________terminal of the electric cell to the ______terminal.
a)
Negative to positive
b)
Positive to negative
c)
Positive to positive
d)
None of these
|
Moumita Kumar answered |
The electric current always flows from the higher potential to lower potential. The positive terminal of an electric cell is at higher potential with respect to its negative terminal. Hence, in the given circuit, the current will flow from terminal P to terminal N.
Why does a fused bulb not light up?
- a)Due to a break in the filament
- b)Because the bulb is too old
- c)Because of excessive voltage
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Why does a fused bulb not light up?
a)
Due to a break in the filament
b)
Because the bulb is too old
c)
Because of excessive voltage
d)
None of these
|
|
EduRev Class 6 answered |
A break in the filament disrupts the path of the current between the terminals of the electric cell, and as a result, the fused bulb does not light up because no current can pass through its filament.
Why are MCBs preferred over traditional fuses?- a)They are cheaper
- b)They prevent circuit overloads by automatically switching off
- c)They reduce electricity bills
- d)They increase current flow in circuits
Correct answer is option 'B'. Can you explain this answer?
Why are MCBs preferred over traditional fuses?
a)
They are cheaper
b)
They prevent circuit overloads by automatically switching off
c)
They reduce electricity bills
d)
They increase current flow in circuits
|
|
Sashi Desai answered |
Why MCBs are Preferred Over Traditional Fuses
When it comes to electrical safety and efficiency, Miniature Circuit Breakers (MCBs) hold several advantages over traditional fuses. The key reason for this preference lies in their ability to automatically switch off during overloads.
Automatic Switching Off
- MCBs are designed to detect faults in the circuit, such as overloads or short circuits.
- When an overload occurs, the MCB automatically trips and disconnects the circuit, preventing potential damage to electrical devices and reducing fire risks.
Convenience and Reusability
- Unlike traditional fuses, which need to be replaced once blown, MCBs can simply be reset after they trip.
- This feature saves time and effort, as users do not need to keep spare fuses on hand.
Faster Response Time
- MCBs react much quicker to faults compared to fuses, providing better protection for electrical appliances.
- This rapid response minimizes damage to devices, enhancing their lifespan and reliability.
Enhanced Safety
- MCBs not only protect against overloads but also protect against short circuits, making them a more comprehensive safety solution.
- This dual protection significantly lowers the risk of electrical hazards in homes and workplaces.
In summary, the preference for MCBs over traditional fuses is primarily due to their ability to automatically switch off during overloads, providing enhanced safety, convenience, and efficiency in electrical systems.
When it comes to electrical safety and efficiency, Miniature Circuit Breakers (MCBs) hold several advantages over traditional fuses. The key reason for this preference lies in their ability to automatically switch off during overloads.
Automatic Switching Off
- MCBs are designed to detect faults in the circuit, such as overloads or short circuits.
- When an overload occurs, the MCB automatically trips and disconnects the circuit, preventing potential damage to electrical devices and reducing fire risks.
Convenience and Reusability
- Unlike traditional fuses, which need to be replaced once blown, MCBs can simply be reset after they trip.
- This feature saves time and effort, as users do not need to keep spare fuses on hand.
Faster Response Time
- MCBs react much quicker to faults compared to fuses, providing better protection for electrical appliances.
- This rapid response minimizes damage to devices, enhancing their lifespan and reliability.
Enhanced Safety
- MCBs not only protect against overloads but also protect against short circuits, making them a more comprehensive safety solution.
- This dual protection significantly lowers the risk of electrical hazards in homes and workplaces.
In summary, the preference for MCBs over traditional fuses is primarily due to their ability to automatically switch off during overloads, providing enhanced safety, convenience, and efficiency in electrical systems.
What happens to a filament inside a light bulb when electricity flows through it?- a)It remains cool
- b)It emits a magnetic field
- c)It produces light by heating up
- d)It dissolves
Correct answer is option 'C'. Can you explain this answer?
What happens to a filament inside a light bulb when electricity flows through it?
a)
It remains cool
b)
It emits a magnetic field
c)
It produces light by heating up
d)
It dissolves
|
Bijoy Datta answered |
Understanding the Filament in a Light Bulb
When electricity passes through the filament of a light bulb, several fascinating processes occur.
1. Heating Effect of Electricity
- When electric current flows through the filament, it encounters resistance.
- This resistance causes the filament to heat up significantly.
2. Incandescence
- As the filament reaches high temperatures (usually around 2000 to 3000 degrees Celsius), it begins to glow.
- This phenomenon is known as incandescence, where the filament emits visible light due to its heat.
3. Light Production
- The intense heat excites the atoms in the filament, causing them to emit photons, which are particles of light.
- This is why the light bulb shines brightly.
4. Material of the Filament
- Most light bulb filaments are made from tungsten due to its high melting point and ability to withstand extreme temperatures without melting.
5. Efficiency and Lifespan
- Traditional incandescent bulbs are not very energy-efficient as a lot of energy is lost as heat rather than light.
- However, they are simple in design and have been widely used for many years.
In summary, when electricity flows through the filament of a light bulb, it heats up and produces light through the process of incandescence. This transformation from electrical energy to light energy is what makes light bulbs an essential part of our daily lives.
When electricity passes through the filament of a light bulb, several fascinating processes occur.
1. Heating Effect of Electricity
- When electric current flows through the filament, it encounters resistance.
- This resistance causes the filament to heat up significantly.
2. Incandescence
- As the filament reaches high temperatures (usually around 2000 to 3000 degrees Celsius), it begins to glow.
- This phenomenon is known as incandescence, where the filament emits visible light due to its heat.
3. Light Production
- The intense heat excites the atoms in the filament, causing them to emit photons, which are particles of light.
- This is why the light bulb shines brightly.
4. Material of the Filament
- Most light bulb filaments are made from tungsten due to its high melting point and ability to withstand extreme temperatures without melting.
5. Efficiency and Lifespan
- Traditional incandescent bulbs are not very energy-efficient as a lot of energy is lost as heat rather than light.
- However, they are simple in design and have been widely used for many years.
In summary, when electricity flows through the filament of a light bulb, it heats up and produces light through the process of incandescence. This transformation from electrical energy to light energy is what makes light bulbs an essential part of our daily lives.
Which of these is a source of direct current (DC)?- a)Electric generator
- b)Solar cell
- c)Alternating current mains
- d)Transformer
Correct answer is option 'B'. Can you explain this answer?
a)
Electric generator
b)
Solar cell
c)
Alternating current mains
d)
Transformer
|
|
Rajveer Banerjee answered |
Understanding Direct Current (DC)
Direct current (DC) is a type of electrical current that flows in one direction only. It is commonly used in various applications, including batteries and solar cells. Let's explore the options provided to understand why a solar cell is the correct answer.
Options Analysis
- Electric Generator:
- Generators can produce both AC (alternating current) and DC, depending on their design. However, most conventional generators produce AC, which can be converted to DC using a rectifier.
- Solar Cell:
- A solar cell directly converts sunlight into electricity in the form of DC. This is the primary reason it is considered a source of DC. The output is stable and flows in one direction, making it ideal for charging batteries and powering DC devices.
- Alternating Current Mains:
- The mains electricity supply in homes typically provides AC, which alternates the direction of flow. Therefore, it cannot be classified as a source of DC.
- Transformer:
- A transformer is used to change the voltage of AC electricity. It does not generate electricity itself and only works with AC, further confirming it is not a source of DC.
Conclusion
Among the options given, the solar cell is the only one that consistently produces direct current. Its ability to convert light energy into electrical energy in one direction makes it a reliable source of DC, essential for many modern technologies.
Direct current (DC) is a type of electrical current that flows in one direction only. It is commonly used in various applications, including batteries and solar cells. Let's explore the options provided to understand why a solar cell is the correct answer.
Options Analysis
- Electric Generator:
- Generators can produce both AC (alternating current) and DC, depending on their design. However, most conventional generators produce AC, which can be converted to DC using a rectifier.
- Solar Cell:
- A solar cell directly converts sunlight into electricity in the form of DC. This is the primary reason it is considered a source of DC. The output is stable and flows in one direction, making it ideal for charging batteries and powering DC devices.
- Alternating Current Mains:
- The mains electricity supply in homes typically provides AC, which alternates the direction of flow. Therefore, it cannot be classified as a source of DC.
- Transformer:
- A transformer is used to change the voltage of AC electricity. It does not generate electricity itself and only works with AC, further confirming it is not a source of DC.
Conclusion
Among the options given, the solar cell is the only one that consistently produces direct current. Its ability to convert light energy into electrical energy in one direction makes it a reliable source of DC, essential for many modern technologies.
Which of the following materials is NOT a good conductor of electricity?- a)Copper
- b)Iron
- c)Plastic
- d)Silver
Correct answer is option 'C'. Can you explain this answer?
a)
Copper
b)
Iron
c)
Plastic
d)
Silver
|
|
Nishanth Majumdar answered |
Understanding Electrical Conductors
Electricity flows through materials due to the movement of charged particles, mainly electrons. The ability of a material to allow this flow is known as electrical conductivity.
Conductors vs. Insulators
- Good Conductors: Materials that allow electricity to flow easily. Examples include:
- Copper: Widely used in wiring due to its excellent conductivity.
- Iron: Also a conductor, though not as efficient as copper or silver.
- Silver: The best conductor of electricity, often used in high-end electronics.
- Poor Conductors (or Insulators): Materials that do not allow electricity to flow easily.
Why Plastic is an Insulator
- Structure of Plastic:
- Plastic is a synthetic material made from polymers.
- Its molecular structure lacks free electrons, which are essential for conducting electricity.
- Common Uses of Plastic:
- Used in insulation for wires, electrical devices, and household items to prevent electrical shocks and short circuits.
Conclusion
In summary, while copper, iron, and silver are excellent conductors of electricity, plastic is not due to its lack of free-moving charged particles. This makes it a valuable material for insulating electrical components.
Electricity flows through materials due to the movement of charged particles, mainly electrons. The ability of a material to allow this flow is known as electrical conductivity.
Conductors vs. Insulators
- Good Conductors: Materials that allow electricity to flow easily. Examples include:
- Copper: Widely used in wiring due to its excellent conductivity.
- Iron: Also a conductor, though not as efficient as copper or silver.
- Silver: The best conductor of electricity, often used in high-end electronics.
- Poor Conductors (or Insulators): Materials that do not allow electricity to flow easily.
Why Plastic is an Insulator
- Structure of Plastic:
- Plastic is a synthetic material made from polymers.
- Its molecular structure lacks free electrons, which are essential for conducting electricity.
- Common Uses of Plastic:
- Used in insulation for wires, electrical devices, and household items to prevent electrical shocks and short circuits.
Conclusion
In summary, while copper, iron, and silver are excellent conductors of electricity, plastic is not due to its lack of free-moving charged particles. This makes it a valuable material for insulating electrical components.
Why are rubber and plastic used in electrical appliances?- a)To conduct electricity
- b)To act as a conductor
- c)To insulate and prevent accidental electric shocks
- d)To increase the efficiency of the electric circuit
Correct answer is option 'C'. Can you explain this answer?
a)
To conduct electricity
b)
To act as a conductor
c)
To insulate and prevent accidental electric shocks
d)
To increase the efficiency of the electric circuit
|
Eduskill Classes answered |
Rubber and plastic are used in electrical appliances primarily for insulation purposes. They prevent accidental electric shocks by covering wires and components, ensuring that electricity flows only through the intended paths and reducing the risk of electric hazards.
Cell is a device which- a)electrical energy into light energy
- b)converts chemical energy into electrical energy
- c)electrical energy into magnetic energy
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
Cell is a device which
a)
electrical energy into light energy
b)
converts chemical energy into electrical energy
c)
electrical energy into magnetic energy
d)
None of these
|
Upsc Toppers answered |
In a cell, chemicals are used to produce potential difference.
A battery is- a)a combination of cells in which cells are joined (+) to (-)
- b)a single cell
- c)a combination of cells in which cells are joined (+) to (+)
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
A battery is
a)
a combination of cells in which cells are joined (+) to (-)
b)
a single cell
c)
a combination of cells in which cells are joined (+) to (+)
d)
None of these
|
|
Gunjan Lakhani answered |
A battery is made up of multiple cells connected together, where the positive terminal of one cell is connected to the negative terminal of the next, forming a series connection. This allows the battery to generate a higher voltage.
Therefore,Right Answer- Option A
Therefore,Right Answer- Option A
Chapter doubts & questions for Electricity - Preparation for NCEE 2025 is part of Primary 6 exam preparation. The chapters have been prepared according to the Primary 6 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Primary 6 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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