Question.
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?
solution:
This is because
(i) resistivity of an alloy is generally higher than that of pure metals
(ii) an alloy does not oxidise at high temperatures.
This is because
(i) resistivity of an alloy is generally higher than that of pure metals
(ii) an alloy does not oxidise at high temperatures.