Red Seal Electrician Practice
AC theoryQuestion 971 of 1506

A parallel R-C circuit is on an AC supply. What is the range of the circuit current phase angle compared with the supply voltage?

  1. Between 0 and -90 degrees
  2. Between 0 and +90 degrees
  3. Exactly 0 degrees
  4. Between +90 and +180 degrees
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Correct answer: Between 0 and +90 degrees

The capacitor branch current leads the voltage and the resistor branch is in phase, so the total current leads by less than 90 degrees.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 4.4: Parallel Resistor-Capacitor Circuits

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Questions last reviewed: 18 October 2026