Which unit correctly represents energy delivered when one watt is expended for one hour?

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Multiple Choice

Which unit correctly represents energy delivered when one watt is expended for one hour?

Energy delivered equals power times time, so when time is measured in hours the natural unit is the watt-hour. If you run one watt for one hour, you’ve delivered one watt-hour of energy. That directly captures the scenario without converting to another time unit. Larger units exist: a kilowatt-hour is 1000 watt-hours, and a megawatt-hour is 1,000,000 watt-hours. The joule is also an energy unit, and 1 watt-hour equals 3600 joules, so 1 W for 1 h is 3600 J. The straightforward representation for this situation is a watt-hour.

Energy delivered equals power times time, so when time is measured in hours the natural unit is the watt-hour. If you run one watt for one hour, you’ve delivered one watt-hour of energy. That directly captures the scenario without converting to another time unit. Larger units exist: a kilowatt-hour is 1000 watt-hours, and a megawatt-hour is 1,000,000 watt-hours. The joule is also an energy unit, and 1 watt-hour equals 3600 joules, so 1 W for 1 h is 3600 J. The straightforward representation for this situation is a watt-hour.

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