Q.3:- An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, thepower consumed will be –(a) 100 W (b) 75 W (c) 50 W (d) 25 W
= 484 Ω
The resistance of the bulb remains constant
if the supply voltage is reduced to 110 V then Vʹ=110 V
the power consumed by it is given by the expression = Vʹ2/R
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