Question

If electrical energy costs $0.12 per kilowatt-hour, how much do the following events cost? (a) To burn a 40.0-W lightbulb for 24 h. (b) To operate an electric oven for 3.9 h if it carries a current of 20.0 A at 220 V. $

Answer 1

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t0 3/secnesy Ca p 4ow Means it Consumes Total energy it Consumesin t= 24hrs 40x24x360)= 3.456X1J Cost 1kwh 36X10 J O-12 f 3.456x1 0.12 x3.456X10 Cort 36X105 O-1152 1-20 A -220V 4400 3/scc 4400 W P = VI = 220x20 4400x3.9x3600) J 3.9 X3600 scc O.12 X440D x3.9 X3600 3610 2.0592$