Red Seal Electrician Practice
AC theoryQuestion 965 of 1506

In a series R-C circuit, what range can the impedance phase angle have?

  1. Between 0 and +90 degrees
  2. Between 0 and -90 degrees
  3. Exactly -90 degrees
  4. Exactly 0 degrees
Show answer

Correct answer: Between 0 and -90 degrees

The resistor gives 0 degrees and the capacitor gives -90 degrees, so the sum falls between them.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 4.3: Series Resistor-Capacitor Circuits

Practice ac theory

Questions last reviewed: 18 October 2026