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An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be :
(a) 100 W (b) 75 W
(c) 50 W (d) 25 W
(d) 25 W
Explanation: Resistance of bulb
R = V2/P
R = (220 X 220)/100
R = 484Ω
Power used by 110 V bulb
P' = V2/R
= (110 X 110)/484
=25W
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