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The power flow through a dc motor runs from

  • A.electrical input, through the air gap, to shaft output
  • B.shaft input, through the air gap, to electrical output
  • C.the field winding to the armature winding directly
  • D.the commutator to the field winding and out at the shaft

Answer: A

Stator copper and iron losses come off the input, the remainder crosses the air gap as the product of back emf and armature current, and mechanical losses come off before the shaft. Reversing that flow is generator operation.

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