COMMUTATOR

commutator

(noun) switch for reversing the direction of an electric current

Source: WordNet® 3.1

Noun

commutator (plural commutators)

An electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.

(group theory) A binary map in a given group G, given by [g, h] = ghg⁻¹h⁻¹, where g and h are elements of G, which yields the group's identity if and only if the group operation commutes for g and h.

(ring theory) A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.

Source: Wiktionary

Com"mu*ta`tor, n. (Elec.)

Definition: A piece of apparatus used for reversing the direction of an electrical current; an attachment to certain electrical machines, by means of which alternating currents are made to be continuous or to have the same direction.

Source: Webster’s Unabridged Dictionary 1913 Edition

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