Q.

An electric bulb is rated 220 volt -100 watt. The power consumed by it when operated on 110 volt will be

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a

75 watt

b

40 watt

c

25 watt

d

50 watt

answer is C.

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Detailed Solution

R=Vrated 2Prated =220×220100=484 ohm  Power consumed at 110V=110×110484=25 WPower is voltage squared over resistance, or P= V2R. Likewise, resistance is voltage squared over power.
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