For semi conductor to have negative temperature... - JAMB Physics 2004 Question
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 option: a
Temperature coefficient of resistance is given by
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.
| α = | Increase in resistance per oC rise in temp. |
| __resistance at 0oC |
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.
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