CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 2
Why are the heating elements of electric toasters and electric irons made of an alloy rather than a pure metal ?
Answer
An alloy has higher resistivity than pure metals, so it gives more heat, and it does not oxidise readily when red hot.
An alloy (such as nichrome) has a higher resistivity than its constituent pure metals, so the element has a high resistance and produces more heat (). An alloy also does not oxidise (burn) readily at the high temperature of a heating element.
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