Discussion
Which of the following is not an alternator component?
The commutator
The rotor
The stator
The rectifier bridge
Answer: A
A commutator belongs to a direct current machine, where it reverses the coil current; an alternator uses slip rings instead. Rotor, stator and rectifier are all alternator parts. That distinction separates the alternator from the dynamo it replaced. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.
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