Red Seal Electrician Practice
Electrical mathQuestion 913 of 1506

A sine wave has a peak value of 50 V. What is its practical average value?

  1. About 35.4 V
  2. About 25 V
  3. About 31.9 V
  4. About 100 V
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Correct answer: About 31.9 V

Average = 0.637 × peak = 0.637 × 50 V ≈ 31.9 V.

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

Practice electrical math

Questions last reviewed: 18 October 2026