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Household Electrification

An electric b...

Question

An electric bulb is rated as 400 W, 250 volt (i) find the rated current
(ii) if the bulb is connected to a 200 V supply, find its power

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Solution

Given : $V = 250$ volts $P = 400$ W $V_{s} = 200$ volts
(i) : Rated current $I = \frac{P}{V} = \frac{400}{250} = 1.6$ A
(ii) : Power $P^{'} = V_{s} I = 200 \times 1.6 = 320$ W

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