Power factor and three-phaseQuestion 1199 of 1506

In three-phase power systems, which harmonics are significant?

  1. The even-numbered harmonics
  2. Only the 2nd harmonic
  3. The odd-numbered harmonics
  4. None
Show answer

Correct answer: The odd-numbered harmonics

Even harmonics tend to cancel in three-phase systems.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.4: Power Quality Measurement

Practice power factor and three-phase

Questions last reviewed: 18 October 2026