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Class 7 Science Chapter 3 NCERT Book - Electricity: Circuits and their Components

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FAQs on Class 7 Science Chapter 3 NCERT Book - Electricity: Circuits and their Components

1. What is an electric circuit and how does it work?
Ans. An electric circuit is a closed loop that allows electric current to flow from a power source, such as a battery, through various components, and back to the source. It consists of conductors (such as wires), a power source, and devices that use electricity (like bulbs or motors). When the circuit is complete, the current flows, powering the devices connected in the circuit.
2. What are the main components of an electric circuit?
Ans. The main components of an electric circuit include a power source (like a battery), conductors (wires), and load devices (like bulbs or resistors) that consume electricity. Additionally, switches can be used to open or close the circuit, and fuses or circuit breakers can provide safety by preventing overload.
3. What is the difference between a series circuit and a parallel circuit?
Ans. In a series circuit, all components are connected end-to-end, so the same current flows through each component. If one component fails, the entire circuit stops working. In a parallel circuit, components are connected across common points, allowing current to flow through multiple paths. If one component fails, others can still work.
4. How can we measure the current in an electric circuit?
Ans. To measure the current in an electric circuit, we use an ammeter. The ammeter must be connected in series with the circuit, which means it should be part of the current path. It will then show the amount of current flowing through the circuit, measured in amperes (A).
5. Why are conductors and insulators important in electrical circuits?
Ans. Conductors, such as copper and aluminum, allow electric current to flow easily, making them essential for wires and circuit components. Insulators, like rubber and plastic, prevent the flow of electricity, providing safety by protecting users from electric shocks and preventing short circuits. Together, they ensure the circuit functions properly and safely.
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