Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Monjur Alahi

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Salim Ahmed Kawsar

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The resistivity of an alloy is higher than the pure metal and it does not corrode easily. Moreover, even at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal.

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Salim Ahmed Kawsar

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a) Resistivity of iron = 10.0 × 10-8

Resistivity of Mercury = 94.0 × 10-8

Resistivity of an alloy is greater than iron. By this we conclude that, Iron is good conductor of heat comparing to Mercury.

b) Resistivity of silver is less, hence it is a good conductor of heat.

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