why coils of electric wire are made up of alloy
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Coils of electric toasters and electric irons made of an alloy rather than a pure metal because the resistivity of an alloy is higher than the pure metal. Also at high temperatures, the alloys do not melt easily.
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Because of following reasons :-
1. Alloy has higher resistivity than pure metal.
2. It has high melting point and does not burn readily or oxidise
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