Discussion
Which advantage does an alternator have over a dynamo?
Answer: B
An alternator charges at engine idle whereas a dynamo needed a considerable speed before it produced anything. Rectification adds complexity rather than removing it. The idle output is what modern electrical loads demand. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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