Question

The resistance of pure metals ___________

(a) Increases with an increase in temperature

(b) Decreases with an increase in temperature

(c) Remains the same with an increase in temperature

(d) Becomes zero with an increase in temperature

This question was addressed to me in class test.

My question is from Temperature Coefficient of Resistance topic in division Simple DC Networks of Basic Electrical Engineering

Answer 1

Correct option is (a) Increases with an increase in temperature

Easiest explanation: In a conductor, the valence band and conduction band overlap each other, there is an excess of electrons in the conduction band. When the temperature increases, there is an overcrowding of electrons in the conduction band hence reducing the mobility and hence resistance increases.