Red Seal Electrician Practice
AC theoryQuestion 926 of 1506

Two voltages of the same frequency are 45 degrees out of phase. How does the phase shift change at later times in the cycle?

  1. It grows to 90 degrees.
  2. It falls to zero.
  3. It reverses sign every half cycle.
  4. It stays at 45 degrees.
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Correct answer: It stays at 45 degrees.

Waves at equal frequency keep a constant angular difference at every point.

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

Practice ac theory

Questions last reviewed: 18 October 2026