"electromotive force reckoned in volts," 1882, from volt + -age.
Entries linking to voltage
volt n.
unit of electromotive force, 1873, back-formation from voltaic.
-age
word-forming element in nouns of act, process, function, condition, from Old French and French -age, from Late Latin -aticum "belonging to, related to," originally neuter adjectival suffix, from PIE *-at- (source of Latin -atus, past participle suffix of verbs of the first conjugation) + *-(i)ko-, secondary suffix forming adjectives (see -ic).
amperage n.
strength of an electric current, 1889, from ampere, on the model of voltage; see -age.