watt-hour
noun
: 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
According to a Goldman Sachs report on data center power, a Google search consumes 0.3 watt-hours of electricity; one ChatGPT search consumes 2.9 watt-hours.
—
Emily Forlini, PC Magazine, 22 Apr. 2025
For comparison, lithium-ion batteries can only store up to 180 watt-hours.
—Nadezhda Kosareva, Forbes, 30 Dec. 2024
Air Asia: Guests may only carry power banks that do not exceed 100 watt-hours (Wh) or 20,000 milliampere-hours (mAh).
—Kathleen Magramo, CNN Money, 26 Mar. 2025
Running the model on two Ampere GPUs resulted in 0.32 watt-hours per request, compared to just 0.15 watt-hours on one Hopper GPU.
—Ars Technica, 24 Mar. 2025
Zhu says Lenovo is targeting between two and 2.5 hours of battery life in demanding heavy games — which lines up with the basic math of dividing a 55 watt-hour battery by 20 watts, assuming the rest of the system doesn’t eat up a lot more.
—Sean Hollister, The Verge, 7 Jan. 2025
Remarkably, during 2023 Maryland’s entire fossil fuel industry generated 16.7 TWh (trillion watt-hours) of electric power.
—Alex Pavlak, Baltimore Sun, 6 Jan. 2025
Graphene has a phenomenal capacity, up to 1,000 watt-hours of energy per kilogram.
—Nadezhda Kosareva, Forbes, 30 Dec. 2024
Google has estimated that each online search takes up 0.3 watt-hours worth of electricity, and the latest estimates on generating images with services like DALL-E peg one image at the same energy requirement as charging up your mobile phone.
—Alexander Puutio, Forbes, 22 Dec. 2024
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Emily Forlini, PC Magazine, 22 Apr. 2025
For comparison, lithium-ion batteries can only store up to 180 watt-hours.
—Nadezhda Kosareva, Forbes, 30 Dec. 2024
Air Asia: Guests may only carry power banks that do not exceed 100 watt-hours (Wh) or 20,000 milliampere-hours (mAh).
—Kathleen Magramo, CNN Money, 26 Mar. 2025
Running the model on two Ampere GPUs resulted in 0.32 watt-hours per request, compared to just 0.15 watt-hours on one Hopper GPU.
—Ars Technica, 24 Mar. 2025
Zhu says Lenovo is targeting between two and 2.5 hours of battery life in demanding heavy games — which lines up with the basic math of dividing a 55 watt-hour battery by 20 watts, assuming the rest of the system doesn’t eat up a lot more.
—Sean Hollister, The Verge, 7 Jan. 2025
Remarkably, during 2023 Maryland’s entire fossil fuel industry generated 16.7 TWh (trillion watt-hours) of electric power.
—Alex Pavlak, Baltimore Sun, 6 Jan. 2025
Graphene has a phenomenal capacity, up to 1,000 watt-hours of energy per kilogram.
—Nadezhda Kosareva, Forbes, 30 Dec. 2024
Google has estimated that each online search takes up 0.3 watt-hours worth of electricity, and the latest estimates on generating images with services like DALL-E peg one image at the same energy requirement as charging up your mobile phone.
—Alexander Puutio, Forbes, 22 Dec. 2024
Cite this Entry
“Watt-hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/watt-hour. Accessed 24 May. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share