Red Seal Electrician Practice
AC theoryQuestion 977 of 1506

What is the impedance phase angle of a perfect inductor?

  1. -90 degrees
  2. 0 degrees
  3. +90 degrees
  4. +45 degrees
Show answer

Correct answer: +90 degrees

In an inductor the voltage always leads the current by 90 degrees.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 5.1: Review of R, X, and Z

Practice ac theory

Questions last reviewed: 18 October 2026