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AC Applied to a Resistor

A 220 volt, 1...

Question

A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The powerconsumed will be

A

750 watt

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B

500 watt

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C

250 watt

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D

1000 watt

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Solution

The correct option is B 250 watt
The resistance of the bulb is $R = \frac{220^{2}}{1000} = 48.4$ ohm.
Power consumed, $P = \frac{V^{2}}{R} = \frac{110^{2}}{48.4} = 250$ watt

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