For semi conductor to have negative temperature coefficient of resistance implies that?

A. their resistance decrease with temperature
B. The resistance increase with temperature
C. their resistance is constantly changing with temperature
D. they have electrons and holes at high temperature

Correct Answer:

Option A – their resistance decrease with temperature

Explanation

Temperature coefficient of resistance is given by
α = Increase in resistance per oC rise in temp./resistance at 0°C

And for metals where resistance increase with temperature rise, temperature coefficient of resistance is positive; on the other hand in semi conductors, where resistance decrease with temperature rise, temperature coefficient of resistance is negative.