watt-hour

American  

[wot-ou^uhr, -ou-er] / ˈwɒtˌaʊər, -ˌaʊ ər /

Or watthour

noun

1. a unit of energy equal to the energy of one watt operating for one hour, equivalent to 3600 joules. Wh

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watt-hour British  

noun

1. a unit of energy equal to a power of one watt operating for one hour. 1 watt-hour equals 3600 joules

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watt-hour Scientific  

1. A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour. It is equivalent to 3,600 joules.

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Etymology

Origin of watt-hour

First recorded in 1885–90

Example Sentences

The Consortium, which is led by DOE's Pacific Northwest National Laboratory, is striving to make batteries with an energy density of 500 watt-hours per kilogram -- more than double the energy density of today's state-of-the-art batteries.

From Science Daily

For low-income households and homeowners in areas with high fire risk or multiple blackouts, the incentive rises to 85 cents per watt-hour, enough to cover most of the cost of a battery.

From Los Angeles Times

The spec sheet mentions using that space for a larger battery, however, it lists the new model’s unit at 51 watt-hours, compared to the 9310’s 52.

From The Verge

This one can hold 500 watt-hours of power and can run a small fridge as well as charge devices.

From The Verge

The goal is to produce batteries with an energy density of “up to 1,200 watt-hours per liter,” Morris said — a staggering number that some experts have questioned.

From The Verge