Red Seal Electrician Practice
AC theoryQuestion 924 of 1506

In an AC circuit analysis, what is usually used as the reference for phase angles?

  1. The total load current at 0 degrees
  2. The source voltage at 0 degrees
  3. The ground wire
  4. The lowest-voltage component
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Correct answer: The source voltage at 0 degrees

Phase is always relative, and the source voltage is the usual reference.

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

Practice ac theory

Questions last reviewed: 18 October 2026