A 220V, 1000W bulb is connected across a 110V main supply. The power consumed will be
1000W
750W
250W
500W
A
1000W
B
250W
C
750W
D
500W
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Solution
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Power, P=V2/R so the resistance of bulb is R=V2/P=22021000=48.4Ω
Power consumed =V2mR=110248.4=250W
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