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

Given

An electric bulb is rated 220V and 100W

Find out

Power consumed when it is operated on 110 V

Solution

As per the equation P = V2/R

we have If V = 220 V

100 W = 2202/R

R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb.

When V = 110 V, power consumed = V2/R = 1102/484 = 25 W.

So, 25 W power is consumed when it is operated on 110 V.

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