English
ampacity
Blend of ampere + capacity.
Proto-Italic *kapjō
…
Latin capāx ‘that can hold much’
Latin capācitās ‘capability, capacity’
Old French capacite
Middle English capacite
English capacity
Today it means
noun The root mean square of the electrical current which a device (usually a wire) can carry within a specific environment (including temperature rating, power loss, heat dissipation, etc.) It is measured in amperes (amps) and is most often used to rate electrical wires and cables.
Language periods are conventional ranges, not dates for this word.
Etymograph / ampacity