If a device uses 200 watts for 3 hours, how many kilowatt-hours does it use?

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Multiple Choice

If a device uses 200 watts for 3 hours, how many kilowatt-hours does it use?

Explanation:
Energy used is found by multiplying power by time, with power in kilowatts and time in hours. Convert 200 watts to kilowatts: 200 W = 0.2 kW. Over 3 hours, energy = 0.2 kW × 3 h = 0.6 kWh. (Or: 200 W × 3 h = 600 Wh = 0.6 kWh.) So the device uses 0.6 kilowatt-hours.

Energy used is found by multiplying power by time, with power in kilowatts and time in hours. Convert 200 watts to kilowatts: 200 W = 0.2 kW. Over 3 hours, energy = 0.2 kW × 3 h = 0.6 kWh. (Or: 200 W × 3 h = 600 Wh = 0.6 kWh.) So the device uses 0.6 kilowatt-hours.

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