Power factor and three-phaseQuestion 1197 of 1506

On a 60 Hz power system, what is the frequency of the 5th harmonic?

  1. 300 Hz
  2. 12 Hz
  3. 65 Hz
  4. 120 Hz
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Correct answer: 300 Hz

The 5th harmonic is 5 x 60 Hz = 300 Hz.

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