A 1500 W device runs for 2 hours. How many watt-hours of energy does it consume?

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Multiple Choice

A 1500 W device runs for 2 hours. How many watt-hours of energy does it consume?

Explanation:
Energy used equals power times time. A device rated at 1500 W running for 2 hours uses 1500 W × 2 h = 3000 watt-hours. So the energy consumed is 3000 Wh. If you convert to joules, that’s 3000 Wh × 3600 J/Wh = 10,800,000 J (10.8 MJ). The other numbers don’t fit because they’d require different run times or unit conversions (for example, 3000 J would correspond to only about 2 seconds at 1500 W, 2 Wh is energy for only a few seconds of operation, and 1500 Wh would be energy for 1 hour of operation).

Energy used equals power times time. A device rated at 1500 W running for 2 hours uses 1500 W × 2 h = 3000 watt-hours. So the energy consumed is 3000 Wh. If you convert to joules, that’s 3000 Wh × 3600 J/Wh = 10,800,000 J (10.8 MJ). The other numbers don’t fit because they’d require different run times or unit conversions (for example, 3000 J would correspond to only about 2 seconds at 1500 W, 2 Wh is energy for only a few seconds of operation, and 1500 Wh would be energy for 1 hour of operation).

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