Red Seal Electrician Practice
AC theoryQuestion 923 of 1506

Wave A reaches its positive peak earlier in time than wave B, and both have the same frequency. How is A described relative to B?

  1. Lagging
  2. In phase
  3. At 180 degrees by definition
  4. Leading
Show answer

Correct answer: Leading

The wave that is ahead in its cycle leads the other.

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

Practice ac theory

Questions last reviewed: 18 October 2026