AC theoryQuestion 919 of 1506

A sine wave has a peak of 100 V and an RMS value of 70.7 V. What is its crest factor?

  1. 0.707
  2. 1.11
  3. 1.41
  4. 7.07
Show answer

Correct answer: 1.41

Crest factor = peak / RMS = 100 / 70.7 = 1.41.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 1.3: Measurements of AC Magnitude

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Questions last reviewed: 18 October 2026