In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc. an alloy such as Nichrome is used, not pure metals.

Explanation

The working of heating devíces such as a toaster and an electric iron Is based on the heating effect of electric current, Le., conversion of electric energy into heat by passage of electric current through a metallie conductor.
(2) An alloy, such as Nichrome, has high resistivity and it can be heated to a high temperature without oxidation, in contrast to pure metals, Therefore, the coils in heating devices such as a toaster and an electric iron are made of an alloy, such as Nichrome, rather than a pure metal.