Q22 of 238 Page 114

Explain the importance of using in a household electric circuit

(i) fuse, and


(ii) earthing wire.

(i) fuse is used for the purpose of protection, and mainly used for avoiding the short circuit.

(ii) it is very important as it reduces the risk of electric sock, when live wire accidently touches the metal.


More from this chapter

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21

When does a fuse cut off current? How does it do it?

 21

What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse?

 23

An electric iron is rated at 230 V, 750 W. Calculate

(i) the maximum current, and


(ii) the number of units of electricity it would use in 30 minutes.

 23

Which of the following fuse ratings would be suitable for this electric iron ?

1 A, 3 A, 5 A, 13 A