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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

Solution
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Given : V=250 volts P=400 W Vs=200 volts
(i) : Rated current I=PV=400250=1.6 A
(ii) : Power P=VsI=200×1.6=320 W

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