Effect of temperature on Resistance Of Materials

Effect of temperature on Resistance Of Materials

In pure metals the resistance of the substance increases with the increase in it’s temperature. The increase is large and fairly regular for normal ranges of temperature. Or metals have a positive temperature coefficient of resistance. 
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Effect of temperature on Resistance Of Material

In alloys also the increase in temperature results in increase of it’s resistance, but unlike pure metals the increase is relatively small and irregular. For some high resistance alloys like Eureka ( Cu 60% & Ni 40%) and maganin , the increase in resistance is ( or can be made) negligible over a considerable range of temperature.

Unlike Metals and Alloys Electrolytes , Insulators and partial conductors such as carbon acts opposite ; In these materials increase in temperature results in decrease in resistance. And thus insulators are said to be in negative temperature coefficient of resistance.

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