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Resistance and Resistivity Video Lecture | Physics Class 12 - NEET
FAQs on Resistance and Resistivity Video Lecture - Physics Class 12 - NEET
| 1. What is resistance? |  |
Ans. Resistance is a measure of the opposition to the flow of electric current in a material. It is represented by the symbol "R" and is measured in ohms (Ω). Resistance depends on factors such as the material's dimensions, temperature, and conductivity.
| 2. What is resistivity? | |
Ans. Resistivity is a material property that determines how strongly a material opposes the flow of electric current. It is represented by the symbol "ρ" (rho) and is measured in ohm-meters (Ω•m). Resistivity is an intrinsic property that depends only on the material and is independent of its shape or size.
| 3. How are resistance and resistivity related? | |
Ans. Resistance and resistivity are related through the formula R = ρL/A, where R is the resistance, ρ is the resistivity, L is the length of the material, and A is its cross-sectional area. This formula shows that resistance is directly proportional to the length of the material and inversely proportional to its cross-sectional area.
| 4. What factors affect resistance and resistivity? | |
Ans. Resistance is affected by factors such as the material's length, cross-sectional area, temperature, and conductivity. Resistivity, on the other hand, is mainly influenced by the material's intrinsic properties, such as the type of material and its temperature.
| 5. How can resistivity be determined experimentally? | |
Ans. Resistivity can be determined experimentally using the formula ρ = RA/L, where ρ is the resistivity, R is the measured resistance, A is the cross-sectional area of the material, and L is its length. By measuring the resistance and knowing the dimensions of the material, resistivity can be calculated.
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