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Electric Switches

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Explain about ammeter, voltmeter ,fuse wire ,fused bulbs ,bulbs in series and parallel .

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Fig. 9.29 below shows two bulbs with switches and fuse connected to the mains through a three pin socket by means of a three wires cable.

Fig. 9.29

(a) Label each component - bulb, switch, fuse and socket.

(b) Name and state the colour of insulation of each wire 1, 2 and 3.

(c) How are the two bulbs joined : in series or in parallel ?

If two bulbs B₁25W and B₂ 100W, both rated at 200 V are connected in series across a 440 volts supply, then

Q. Assertion :In a chain of bulbs, 50 bulbs are joined in series. One bulb is fused now. If the remaining 49 bulbs are again connected in series across the same supply then light gets decreased in the room. Reason: The resistance of 49 bulbs will be more then 50 bulbs in parallel.

Q. 30 bulbs are connected in a series. If one bulb is fused and the remaining 29 bulbs are joined in a series and connected to the same supply, the light in the room will be:

B_{1}, B_{2}

B_{3}

are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.
What happens to the glow of the other two bulbs when the bulbs

B_{1}

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