amp-hour
noun
ˈamp-ˈau̇r
-ˈau̇-ər
variants
or amp hour
plural amp-hours or amp hours
: a unit quantity of electricity equal to the quantity carried past any point of a circuit in one hour by a steady current of one ampere : ampere-hour
Specifications include 6.8 amp-hours and 320 watt-hours per kilogram.—Sara Samora
A larger battery will typically provide higher amp hours, which can help extend your drill's runtime and reduce time spent recharging during a project.—Alex Rennie
—often used before another nounAt freezing temperatures, a fully charged battery delivers only about two-thirds of its rated amp-hour capacity.—Ben Clabes
Cite this Entry
“Amp-hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amp-hour. Accessed 20 Oct. 2026.
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