Question

Which one of the following physical quantities does not affect the resistance of a cylindrical resistor?

(a) The current through it

(b) Its length

(c) The resistivity of the material used in the resistor

(d) The area of cross-section of the cylinder

Answer 1

(a) The current through it

The resistance of a resistor is given by R = ρ l/A, i.e. R

depends on length l , area of cross-section A and nature of material ρ.

Hence, current does not affect the resistance of a cylindrical resistor.