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House Wiring

How should th...

Question

How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

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Solution

All the electrical appliances in a building should be connected in parallel at the mains, each with a separate switch and a separate fuse connected in the live wire so that the switching on or off in a room has no effect on other lamps in the same building.

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Q. How should the electric lamps be connected with the mains so that the switching on or off a lamp has no effect on other lamps ?

Q. (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.

Q. (a) Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?
(b) Christmas tree lamps are usually wired in series. What happens if one lamps breaks?
(c) An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?
(d) Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an

A

on your diagram to show where an ammeter should be placed to measure the current.

Q. How should the electric lamps in a building be connected?

The diagram in Fig. 9.28 shows three lamps and three switches 1, 2 and 3 connected with two cells.

(a) Name the switch/ switches to be closed so as to light all the three lamps.

(b) How are then the lamps connected : in series or in parallel ?

Fig ; 9.28

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