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

Armature shown in black and white with Commutator in colour.

The commutator consists of a ring of the copper wire endings from the surface of the armature. When the armature turns, the commutator is contacted by brushes which slide over it and transmit the generated electricity on to be used.

See also: Armature, Brushes, Electric Motors.

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Subjects: Electronics Physics