The resistivities of three substances at are: silver

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

The resistivities of three substances at 20∘C20^{\circ}\text{C} are: silver 1.6×10−8 Ω m1.6\times10^{-8}\,\Omega\,\text{m}, nichrome 1.1×10−6 Ω m1.1\times10^{-6}\,\Omega\,\text{m}, and iron 1.0×10−7 Ω m1.0\times10^{-7}\,\Omega\,\text{m}. (i) Arrange the three substances in descending order of conductivity. (ii) Which of these would you choose for the heating element of an electric toaster?

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