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SESK: Stuff Everyone Should Know · sesk.info/ham-impedance-unit-ohm

What is the unit of impedance?

Ohm.

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  1. Ohm ✔
  2. Volt
  3. Ampere

Why: Impedance is opposition to alternating current, and it is measured in ohms. Resistance also uses ohms.

Huh, didn't know that: The Greek letter omega is the symbol for ohms.

The dad joke
Where do resistors go to relax? Ohm sweet ohm.
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References

Answer: Ohm. Impedance is opposition to alternating current, and it is measured in ohms. Resistance also uses ohms.

  1. HamStudy 2026 Technician pool, T5C05 hamstudy.org/browse/E2_2026/T5C
    it is measured in the same unit as resistance: ohms.
    Checked 2026-10-09.

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