Effect of Temperature on Resistance

Chapter-3|Current Electricity| NCERT 12th Physics:

Effect of Temperature on Resistance:

Experimentally it was observed that on increasing temperature from T to T+dT, Resistance changes from R₀ to R₀+dR, then

 

For metals the value of α is positive, therefore resistance of the metal increases with rise in temperature. For insulators and semiconductors the value of α is negative, therefore resistance decreases with rise in temperature.

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