Question

an electric bulb is rated 220V ,100W . The bulb is used at 110V . Find the power so consumed​

Answer 1

Answer:

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.

Explanation:

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