Question

why aew coils of electric toaster and electric iron made of an alloy rather than pure metal

Answer 1

This is because the resistivity of an alloy is more than the resistivity of a pure metal and hence more heat is produced in an alloy than in a pure metal due to the flow of the current .Moreover, alloy does not burn (or oxidise) easily even in a higher temperature.

Answer 2

because electric iron and electric toaster are heating appliance and alloys are made up of mixing of two or more metals
which doesn't depends on temperature..
so alloys are used
hope it will help

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