An electric bulb is rated 220 V and 100 WWhen it is operated on 110 V, thepower consumed will be -
(a) 100 W
(b) 75 W
(c) 50 W
(d) 25 W
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Answer:
25 W
Explanation:
R = 220^2/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V^2/R = 110^2/484 = 25 W. So, 25 W power is consumed when it is operated on 110 V.
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