ampacity

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/æmˈpæsɪti/

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.

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Meanings

nounampacity (countable and uncountable, plural ampacities)

plural ampacities

  1. countableuncountableThe 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.

Origin

Blend of ampere + capacity.

Full word history & related roots →

Translations

Portuguese ampacidade
  • ampacidaderoot mean square of the electrical current which a wire can carry
Cite this entry
APA

ampacity. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/ampacity

MLA

“ampacity.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ampacity. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “ampacity,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/ampacity.

Source: ampacity on Wiktionary, CC BY-SA 4.0.