Sarthaks Test
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An electric bulb, when connected across a power supply of 220V, consumes a power of 60W. If the supply drops to 180V, what will be the power consumed? If the supply is suddenly increased to 240V, what will be the power consumed?

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E = 220v

P = 60w

R = V2/P = (220 x 220)/60 = (220 x 11)/3Ω

(a) E = 180v

P = V2/R = (180 x 180 x 3)/(220 x 11) = 40.16 ≈ 40w

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