If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) burning a 120 W light bulb for 24 h straight (b) operating an electric oven for 7.0 h if it carries a current of 20.0 A at 220 V

Question

Physics

Jessica Mercer

23 December, 08:15

If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) burning a 120 W light bulb for 24 h straight (b) operating an electric oven for 7.0 h if it carries a current of 20.0 A at 220 V

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Carolina · Answer 1

a) 120Js¹-*24*3600=10368000J

12cents/36*10^5J*10368000J=34.56 cents

b) W=VQ.

W=VIt

W=220*20*7*3600

=110880000J

12cents/36*10^5J*110880000J

=369.6 cents