Discussion
The commutator of a DC generator acts as a __________.
Answer: B
The commutator acts as a full wave rectifier.
The emf induced in each armature coil of a dc generator is alternating, reversing every time the coil passes from one pole to the next. The commutator reverses the coil's connection to the brushes at exactly that moment, so both half cycles reach the external circuit in the same direction. It is a mechanical full wave rectifier.
A half wave rectifier would pass only one half cycle and block the other, which the commutator does not do. 'Controlled' rectifiers, such as thyristor bridges, vary the point in the cycle at which conduction begins; the commutator's switching is fixed by the brush position, not controlled.
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