Red Seal Electrician Practice
AC theoryQuestion 958 of 1506

At the instant the voltage across a capacitor is at its positive peak, what is the capacitor current?

  1. At its positive peak
  2. At its negative peak
  3. Zero
  4. Equal to the average current
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Correct answer: Zero

At the voltage peak the voltage is not changing, and capacitor current depends on the rate of change.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 4.2: AC Capacitor Circuits

Practice ac theory

Questions last reviewed: 18 October 2026