Red Seal Electrician Practice
MotorsQuestion 1298 of 1506

What gives a resistance split-phase motor its phase shift between the windings?

  1. Its auxiliary winding has fewer, thinner turns, so more resistance.
  2. Its auxiliary winding has more turns of heavy wire, so more inductance.
  3. A capacitor is wired in series with its main winding.
  4. A shorted turn is built into the rotor bars.
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Correct answer: Its auxiliary winding has fewer, thinner turns, so more resistance.

The auxiliary current lags less than the main current, which gives about 30 degrees of difference.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.9: Single-phase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026