Wiring and componentsQuestion 900 of 1506

What limits the current rating of an inductor?

  1. The colour and shape of its core material
  2. Its inductance value in henries only
  3. Wire resistance and its ability to dissipate heat
  4. The frequency of the AC supply only
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Correct answer: Wire resistance and its ability to dissipate heat

Coils are made of wire, so heating from wire resistance sets the maximum current.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 15.5: Practical Considerations - Inductors

Practice wiring and components

Questions last reviewed: 18 October 2026