Red Seal Electrician Practice
AC theoryQuestion 925 of 1506

At what angle does a sine wave reach its largest negative value in one cycle?

  1. 90 degrees
  2. 270 degrees
  3. 180 degrees
  4. 360 degrees
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Correct answer: 270 degrees

The sine wave is zero at 0, peaks at 90, is zero at 180, is at the negative peak at 270 and is zero again at 360.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 1.5: AC Phase

Practice ac theory

Questions last reviewed: 18 October 2026