If a 9 kW appliance runs for 2 hours, how many kilowatt-hours does it consume?

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Multiple Choice

If a 9 kW appliance runs for 2 hours, how many kilowatt-hours does it consume?

Explanation:
Energy usage is found by multiplying the device’s power by the time it runs. A 9 kW appliance running for 2 hours uses 9 × 2 = 18 kWh. So the energy consumed is 18 kilowatt-hours. The other numbers would require different running times, not the 2 hours given. Kilowatt-hours measure energy, not instantaneous power.

Energy usage is found by multiplying the device’s power by the time it runs. A 9 kW appliance running for 2 hours uses 9 × 2 = 18 kWh. So the energy consumed is 18 kilowatt-hours. The other numbers would require different running times, not the 2 hours given. Kilowatt-hours measure energy, not instantaneous power.

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