What is the total cost of using the following at 9 ¢ per kilowatt-hour? An 860 W air conditioner for 6 h, a 4800 W dryer for 30 min, a 900 W coffee machine for 20 min and a 110 W stereo for 3.5 h
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The air conditioner uses 860 W for 6 hours, so the total energy used by the air conditioner is 860 W * 6 h = 5160 Wh. The dryer uses 4800 W for 30 minutes, so the total energy used by the dryer is 4800 W * 0.5 h = 2400 Wh. The coffee machine uses 900 W for 20 Show more…
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