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प्रश्न
The electric power consumed by a 220 V − 100 W bulb when operated at 110 V is ______.
विकल्प
25 W
30 W
35 W
45 W
MCQ
रिक्त स्थान भरें
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उत्तर
The electric power consumed by a 220 V − 100 W bulb when operated at 110 V is 25 W.
Explanation:
Resistance of the bulb = R
= `V^2/P`
= `220^2/100`
= 484 Ω
Power consumed by the bulb when connected to 110 V is
`V^2/R`
= `110^2/484`
= 25 W
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