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प्रश्न
An electric bulb.is rated 220 v and 100 watt power consumed by it when operated on 'no volt is:-
पर्याय
25 watt
50 watt
75 watt
90 watt
MCQ
उत्तर
25 watt
Explanation:
Bulb resistance = R = `v^2/P = (220 xx 220)/100` = 484 Ω
At 110 V, the power consumed is `V^2/R = (110 xx 110)/484` = 25 watt
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