A electric bulb is rated (200 w, 110 v). if it is operated at 55 v, find the power consumed by it
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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.
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