watt-hour

or watt·hour

[ wot-ouuhr, -ou-er ]

noun

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

watt-hour

noun

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

watt-hour

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.

Word History and Origins

Origin of watt-hour¹

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