The resistivity of a material is dependent on the
temperature. Different materials do not exhibit the same dependence on
temperatures.

*ρ*_{T}= ρ_{0 }[1 + α (T–T_{0})]
where ρ

_{T}is the resistivity at a temperature T and**is the same at a reference temperature T***ρ*_{0}_{0}. α is called**the temperature co-efficient of resistivity**, and from the dimension of α is (Temperature)^{–1}.
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