Red Seal Electrician Practice
MotorsQuestion 1225 of 1506

Why does a stepper motor have no horsepower rating?

  1. It may not run continuously, and it is a small device.
  2. Its torque is always rated in ounces, so power cannot be rated.
  3. It is always fed from a DC source, so power cannot be rated.
  4. The drive electronics set its output, so it has no fixed rating.
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Correct answer: It may not run continuously, and it is a small device.

A stepper moves in steps and does not run continuously, so a continuous power rating does not apply.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.5: Stepper Motors

Practice motors

Questions last reviewed: 18 October 2026