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(a) How should the electric lamps in a building be connected so that switching on or off in a room has no effect on other lamps in the building? State one or more advantage of such an arrangement.(b) Which effect of current is utilised in the working of an electric fuse? How does an electric fuse work?(c) What is the usual colour of the insulation of (i) earth wire, and (ii) live wire?(d) When does an electric short circuit occur? What harm can do it?(e) Explain the purpose of earthing an electrical appliance. |
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Answer» (a) How should the electric lamps in a building be connected so that switching on or off in a room has no effect on other lamps in the building? State one or more advantage of such an arrangement. (b) Which effect of current is utilised in the working of an electric fuse? How does an electric fuse work? (c) What is the usual colour of the insulation of (i) earth wire, and (ii) live wire? (d) When does an electric short circuit occur? What harm can do it? (e) Explain the purpose of earthing an electrical appliance. |
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