Red Seal Electrician Practice
AC theoryQuestion 520 of 1506

How is the instantaneous value of a sine wave found?

  1. The cosine of the angle times the peak value
  2. The sine of the angle times the peak value
  3. 0.707 times the peak value
  4. The tangent of the angle times the peak value
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Correct answer: The sine of the angle times the peak value

Instantaneous = sin theta x peak.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 3.4: AC Waveform Analysis

Practice ac theory

Questions last reviewed: 18 October 2026