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Which component holds the output voltage constant?

  • A.The rectifier, which limits the output by conducting only when the voltage exceeds the forward drop of the diodes
  • B.The stator
  • C.The drive belt, whose slip increases as the load rises and therefore limits the output of the machine automatically
  • D.The voltage regulator

Answer: D

The regulator varies the field current so the output stays near fourteen volts whatever the speed or the load. Without it the voltage would rise with engine speed and destroy everything. It is normally integral with the brush holder. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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