Question

An electric bulb is rated 220V and 40W .when it is operated on 110 V.The power consumed will be

Answer 1

Hi friend here is your answer.

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P=V^2/r

r=V^2/P=(220)^2/40

r= resistance of the bulb.

Now

P=V^2/r=(110)^2/[(220)^2/40]

Solve it to get the ans.

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