Does resistance go up or down with an increase in temperature?

  • #1
Femme_physics
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Main Question or Discussion Point

I had 2 people telling me 2 different things...so I don't know the real answer. Does resistance go up or down with an increase in temperature?
 

Answers and Replies

  • #2
uart
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Yes it can go up or down. It depends on the material.
 
  • #3
Femme_physics
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Can it stay constant, too?
 
  • #4
uart
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Can it stay constant, too?
Yes, at least approximately constant. That would be called a low temperature coefficient material.

Materials in which resistance increases with temperature are referred to as having a positive temperature coefficient. Most metals are in this category.

Materials in which resistance decreases with temperature are referred to as having a negative temperature coefficient. Most semiconductors are in this category.
 
  • #5
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In most metals, the resistance goes up with temperature. In semiconductors, the resistance actually decreases as temperature rises. I think resistivity will always change depending on temperature. But for some materials the change might be relatively small.

Actually Manganin is an alloy, which has a coefficient of resistivity of .000002. This is used for resistors because its change in resistivity due to temperature is very close to 0.
 
Last edited:
  • #7
Femme_physics
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The problem with wiki is that it tends to provide more than the needed information which often confuses the reader (i.e. me)... those answers here helped me though..thanks :)
 

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