An electric bulb rated 220V and 500W. Calculate the power when it is operated on 150V.
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Answer:
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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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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