an electric bulb is rated 220 volt and hundred watt what it is operated on 110 volt the power consumed will be what
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P = V2/R
If V = 220 V we have
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.
munazza84:
what is 2
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