Q12 of 330 Page 26

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

If temperature of a metal decrease the resistance will also decrease.


More from this chapter

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10

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

 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 presence of impurities in a metal affect its resistance?

 13

Fill in the following blanks with suitable words :

Resistance is measured in ............. The resistance of a wire increases as the length ...............; as the temperature ................; and as the cross-sectional area ............