Red Seal Electrician Practice
AC theoryQuestion 1484 of 1506

A series circuit has a resistance of 60 Ω and a capacitive reactance of 10 Ω. What is the impedance?

  1. 24.5 Ω
  2. 50.0 Ω
  3. 60.8 Ω
  4. 35.0 Ω
Show answer

Correct answer: 60.8 Ω

Z = √(R² + X²) = √(60² + 10²) = 60.8 Ω. Resistance and reactance are 90° apart, so they do not add directly.

Source: Computed, 4.3: Series Resistor-Capacitor Circuits

Practice ac theory

Questions last reviewed: 18 October 2026