The resistivity of all pure metals increases | vedclass

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(A) The resistivity of pure metals is given by the relation $\rho_T = \rho_0 [1 + \alpha(T - T_0)]$,where $\alpha$ is the temperature coefficient of r

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(A) The resistivity of pure metals is given by the relation $\rho_T = \rho_0 [1 + \alpha(T - T_0)]$,where $\alpha$ is the temperature coefficient of resistivity.For pure metals,$\alpha$ is positive,which means that as the temperature $T$ increases,the resistivity $\rho_T$ also increases.This happens because,with an increase in temperature,the frequency of collisions between free electrons and the vibrating ions of the metal lattice increases,leading to greater resistance to the flow of current.

The resistivity of all pure metals increases with an increase in temperature.

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