Question

Define resistance and resistivity and also give the relation between them. Explain the dependence of resistance on temperature.

Answer 1

Resistance is the measure of a material's ability to oppose the flow of electric current through it. It is denoted by R. ... Resistance of conductors increases with rise in temperaturewhile resistance of semiconductors and electrolytes decreases with rise intemperature.

Answer 2

The resistance of an object (i.e., a resistor ) depends on its shape and the material of which it is composed. Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.