Q10 of 330 Page 26

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

The resistivity of an alloy is generally higher than that of its constituent metals. Alloys do not oxidise readily at high temperatures.


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8

What is nichrome? State its one use.

 9

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

 11

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?

 12

How does the resistance of a pure metal change if its temperature decreases?