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Which machine generates the vehicle's electrical power?

  • A.The alternator
  • B.The starter motor, which acts as a generator once the engine is running and therefore charges the battery in use
  • C.The battery
  • D.The dynamo, which is still fitted to modern vehicles because it produces direct current without any rectification

Answer: A

An alternator is driven by the engine and produces alternating current that is rectified to charge the battery and run the loads. Dynamos were superseded in the nineteen sixties. Integrated starter generators do combine both functions on hybrids. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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