An electric bulb rated 220 V and 100 W. ...

An electric bulb rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be -

75W

40W

25W

50W

Text Solution

Verified by Experts

Resistance of electric bulb `R=V^2/P implies R=(220)^2/100`
Power consumed at 110V `therefore P_(consumed)=(110)^2/((220)^2//100)=25W`

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