An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance R that must be put in series with the bulb so that the bulb delivers the same power is ______ Ω .

Question

An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance R that must be put in series with the bulb so that the bulb delivers the same power is ______ Ω .,

MARKS App · Accepted Answer

Power, P = V 2 R B R B = V 2 P = 100 × 100 200 R B = 50 Ω To produce same power, same voltage (i.e., 100 V ) should be across the bulb. Hence, R = R B R = 50 Ω

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