MotorsQuestion 219 of 1506

Which losses do AC motors have that DC motors do not have?

  1. Armature resistance only
  2. Brush friction and commutator sparking
  3. Hysteresis and eddy-current losses
  4. Losses in the field supply
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Correct answer: Hysteresis and eddy-current losses

The changing field of an AC motor causes extra core losses from hysteresis and eddy currents.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.1: Introduction to AC Motors

Practice motors

Questions last reviewed: 18 October 2026