kilowatt-hour

noun

kilo·​watt-hour ˈki-lə-ˌwät-ˈau̇(-ə)r How to pronounce kilowatt-hour (audio)
ˈkē-lə-
: a unit of work or energy equal to that expended by one kilowatt in one hour or to 3.6 million joules

Examples of kilowatt-hour in a Sentence

Recent Examples on the Web
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.
Multiply your home's cost per kilowatt-hour for electricity by 10. Camila Domonoske, NPR, 22 May 2026 The load-bearing structure houses 106 kilowatt-hours of usable capacity, good enough for up to 474 miles (764 km) of range on the WLTP standard for the 63 or 478 miles (770 km) for the 55. ArsTechnica, 20 May 2026 Every kilogram of mass to orbit, every kilowatt-hour of power, every hour of crew time is meticulously valued and accounted for. Tejpaul Bhatia, Fortune, 20 May 2026 At over 19 cents per kilowatt-hour, the current price of electricity is the highest on record — going back almost 50 years. Claire Malon, Chicago Tribune, 16 May 2026 See All Example Sentences for kilowatt-hour

Word History

First Known Use

1892, in the meaning defined above

Time Traveler
The first known use of kilowatt-hour was in 1892

Browse Nearby Words

Cite this Entry

“Kilowatt-hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/kilowatt-hour. Accessed 29 May. 2026.

Kids Definition

kilowatt-hour

noun
: a unit of work or energy equal to that expended by one kilowatt in one hour and equal to 3.6 million joules

Medical Definition

kilowatt-hour

noun
: a unit of work or energy equal to that expended by one kilowatt in one hour
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