Q9 of 330 Page 26

Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.

Firstly nicrome is an alloy, it has a higher resistivity and consequently a higher resistance.Therefore, it will resist the flow of charges more and lead to development of heat faster.

Secondly alloys like nichrome don't oxidise,i.e burn easily at high temperatures.


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Name the material which is used for making the heating element of an electric iron.

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What is nichrome? State its one use.

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

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Which has more resistance:

(a) a long piece of nichrome wire or a short one?


(b) a thick piece of nichrome wire or a thin piece?