Q2 of 238 Page 113

What is the usual capacity of an electric fuse used (i) in the lighting circuit, and (ii) in the power circuit, of a small house?

i) the usual capacity of an electric fuse used in the lighting circuit is 5A.

ii) in the power circuit of a small house the usual capacity of an electric fuse used is 15A.


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42

A portable radio has a built-in transformer so that it can work from the mains instead of batteries. Is this a step-up or step down transformer?

 1

What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring?

 3

Give the symbol of an electric fuse used in circuit diagrams.

 4

State whether the following statements are true or false:

(a) A wire with a green insulation is usually the live wire.


(b) A miniature circuit breaker (MCB) works on the heating effect of current.