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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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An electric bulb is rated 220 volt - 100 watt. The power consumed by it when operated on 110 volt will be
A. 75 watt
B. 40 watt
C. 25 watt
D. 50 watt
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Correct Answer - C
(c) The resistance of the bulb is `R = V62/P = (220)^2/100`
The power consumed when operated at 110 V is
`P = (110)^2/((200)^2//100) = 100/4 = 25W`.
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