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Resistance and Resistivity Video Lecture | Physics Class 12 - NEET

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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.
105 videos|425 docs|114 tests
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