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Grade: upto college level
        An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
4 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
471 Points
							Sol. E = 2220 v P = 60 w
R = V^2/P = 220 * 220/60 = 220 * 11/3 Ω
(a) E = 180 v P = V^2/R = 180 * 180 * 3/220 *11 = 40.16 = 40 w
(b) E = 240 v P = V^2/R = 240 *240 *3/220 *11 = 71.4 = 71 w

						
4 years ago
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