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Q.

A22O volt,7000 watt bulb is connected across a 110 volt mains supply. The power consumed will be

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a

1000 watt

b

750 watt

c

500 watt

d

250 watt

answer is D.

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Detailed Solution

R=V2P=(220)21000ΩNow P=V2R=(110)2(220)2/1000=(110)2×1000(220)2= 250 W
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