: a unit of work or energy equivalent to the power of one watt operating for one hour

Examples of watt-hour in a Sentence

Recent Examples on the Web The company claims a 20 to 40 percent boost in energy density over current silicon-free designs, with prototypes reaching more than 800 watt-hours per liter at the cell level. IEEE Spectrum, 13 May 2024 Each battery brings 48 volts, 17.5 ampere-hours, and 840 watt-hours. IEEE Spectrum, 16 Feb. 2024 Ijaz: Our target density at a cell level is around 430 watt-hours per liter. IEEE Spectrum, 5 Jan. 2024 Despite this bigger, brighter, and higher-refresh screen, the OLED model touts 30–50 percent more battery life with a 50 watt-hour battery, versus the original 40 Whr. Kevin Purdy, Ars Technica, 9 Nov. 2023 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. Jon Healey, Los Angeles Times, 7 Aug. 2023 This puts it in shooting distance of lower-end conventional batteries such as lithium-iron phosphate cells, which have energy densities around 100 watt-hours per kilogram and are already used for short-range electric vehicles. Daniel Oberhaus, Popular Mechanics, 8 May 2023 By the end of this year, Asp and his team hope to produce a structural-battery panel capable of achieving 75 watt-hours per kilogram. Daniel Oberhaus, Popular Mechanics, 8 May 2023 The addition of silicon processing costs less than $2 per kilowatt-hour, and produces batteries with energy densities of 350 watt-hours per kilogram and 80 percent charging in under 10 minutes. IEEE Spectrum, 4 May 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'watt-hour.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1888, in the meaning defined above

Time Traveler
The first known use of watt-hour was in 1888

Dictionary Entries Near watt-hour

Cite this Entry

“Watt-hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/watt-hour. Accessed 19 Jun. 2024.

Last Updated: - Updated example sentences
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