Red Seal Electrician Practice
Power factor and three-phaseQuestion 1020 of 1506

What is the name for the order in which the three voltages of a three-phase source reach their peaks?

  1. Phase rotation (phase sequence)
  2. Power factor of the circuit
  3. Line balance of the loads
  4. Delta shift of the windings
Show answer

Correct answer: Phase rotation (phase sequence)

Phase rotation tells which of the three voltages peaks first, second and third. It is either 1-2-3 or 3-2-1.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.3: Phase Rotation

Practice power factor and three-phase

Questions last reviewed: 18 October 2026