Question

Differentiate between electrical resistance and resistivity of a conductor.

Answer 1

S. N.	Electrical resistance	Resistivity
1.	At a given temperature, resistance depends on nature of material and dimensions of conductor.	At a given temperature, resistivity depends on the nature of material.
2.	\(R= \frac{m\ell}{ne^2\tau A}\)	\(\rho = \frac{m}{ne^2\tau}\) \(\tau\) is average relaxation time between two successive collision
3.	unit : ohm	unit : ohm – metre