Red Seal Electrician Practice
AC theoryQuestion 953 of 1506

What happens to skin depth as the frequency of the AC rises?

  1. It gets smaller
  2. It gets larger
  3. It stays the same
  4. It becomes equal to the wire radius
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Correct answer: It gets smaller

A higher frequency pushes the current closer to the surface, so the usable depth falls.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 3.6: What Is the Skin Effect? The Skin Depth of Copper in Electrical Engineering

Practice ac theory

Questions last reviewed: 18 October 2026