.12 * 5.0 * 20.0 * 220 / 1000
A * V = watts
watts * 5 = watt·hr
dividing by 1000 gives kw·hr
If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, how much does it cost to operate an electric over for 5.0 h if it carries a current of 20.0 A at 220 V?
1 answer