Question

Why does resistance increase with temperature in metals?

Answer 1

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When temperature increases, the thermal speed of the electrons increases as well as, the amplitude of vibration of the positive ions inside the metal conductor also increase, about their mean positions. Thus, the collisions between the electrons and the positive metal ions become more frequent and this decreases the relaxation time, t, leading to an increase in the resistivity of the conductor.

Answer 2

The specific resistance of a conductor is directly proportional to temperature.

It means that if the temperature increases then resistance also increase and if the temperature decreases than resistance also get decreases..

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