Current and Resistance

Resistance and Temperature

For most materials, as the temperature increases, the resistance -- or the resistivity -- also increases. This can make a great difference in something like a light bulb.

alpha is the temperature coefficient of resistivity -- or, simply, the temperature coefficient.

alpha is negative for Carbon. As the temperature of a carbon resistor increases, the resistance decreases.

Electric Resistance


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(c) Doug Davis, 2002; all rights reserved