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
Verified Correct Answer: A.
Physical Principles & Numerical Solution
The temperature coefficient of resistance is given by
\alpha = \(\frac{\text{Increase in resistance per ºC rise in temp}}{\text{resistance at 0ºC}}\)
And for metals where resistance increases with temperature rise, the temperature coefficient of resistance is positive; on the other hand, in semiconductors, where resistance decreases with temperature rise, the temperature coefficient of resistance is negative.
Source: Myschool Past Questions Archive (Record #12789)