If a device consumes 5 W for 2 hours, how much energy is used in watt-hours?

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Multiple Choice

If a device consumes 5 W for 2 hours, how much energy is used in watt-hours?

Explanation:
Energy usage equals power times time. The device operates at 5 watts for 2 hours, so the energy is 5 W × 2 h = 10 Wh. A watt-hour represents the energy used by a 1-watt load in 1 hour, so this is simply the product of the two given quantities. If it ran for 1 hour, it would use 5 Wh; for 3 hours, 15 Wh.

Energy usage equals power times time. The device operates at 5 watts for 2 hours, so the energy is 5 W × 2 h = 10 Wh. A watt-hour represents the energy used by a 1-watt load in 1 hour, so this is simply the product of the two given quantities. If it ran for 1 hour, it would use 5 Wh; for 3 hours, 15 Wh.

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