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Physics

Domestic Electric Circuits

The diagram s...

Question

The diagram shows an extra lamp wired into an existing $220$ $V A . C .$ lighting system. To operate extra lamp independently a switch should be placed at.

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Solution

The correct option is D $3$
As the wire passing through is connected to the live (red) wire of the $220 V$ AC lighting system, the switch should be placed there in order to regulate the current to be flown through the extra lamp.

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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

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?

Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.

(a) Craw a circuit diagram to show the connections.

(b) Calculate the current drawn from the electric supply.

Q. Two lamp

^{'} A^{'}

ratio

100

Watt

220 V

and

^{'} B^{'}

rated at

60

Watt

200 V

are connected in series to an electric main supply of

220 V

. The ratio of heat produced in lamp

^{'} A^{'}

and lamp

^{'} B^{'}

would be

(S A T)

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The diagram shows an extra lamp wired into an existing 220 V A.C. lighting system. To operate extra lamp independently a switch should be placed at.

The correct option is D 3As the wire passing through is connected to the live (red) wire of the 220V AC lighting system, the switch should be placed there in order to regulate the current to be flown through the extra lamp.

The diagram shows an extra lamp wired into an existing $220$ $V A . C .$ lighting system. To operate extra lamp independently a switch should be placed at.

The correct option is D $3$
As the wire passing through is connected to the live (red) wire of the $220 V$ AC lighting system, the switch should be placed there in order to regulate the current to be flown through the extra lamp.