Question

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

Answer 1

alloy is made up of two different metals nd they have high resistance

Answer 2

The coil of electric iron and toaster are made of alloy having high resistance.

But not from pure metal like copper or aluminium which have relatively very low resistance .

Since , Heat (converted from electrical energy) is given by:-

H=I^2R

So larger the residence more heat is converted from electrical energy keeping the current constant.