Red Seal Electrician Practice
AC theoryQuestion 955 of 1506

At the same high frequency, which wire shows the larger rise in resistance above its DC value?

  1. The small-gauge (thin) wire
  2. The large-gauge (thick) wire
  3. Both rise by the same amount
  4. Neither one changes
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Correct answer: The large-gauge (thick) wire

A thick wire has more unused centre area, so its skin effect is more pronounced than in a thin wire.

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