SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-impedance-opposes-ac

What is impedance?

The opposition to AC current flow.

Start playing free

  1. The opposition to AC current flow ✔
  2. The inverse of resistance
  3. The inverse of reactance

Why: Impedance is the total opposition a circuit presents to alternating current. It can include resistance and frequency-dependent reactance.

Huh, didn't know that: A circuit's impedance can change when the signal frequency changes.

The dad joke
Why was impedance so hard to talk to? It opposed everything AC said.
Like this card?
Play the game

References

Answer: The opposition to AC current flow. Impedance is the total opposition a circuit presents to alternating current. It can include resistance and frequency-dependent reactance.

  1. NCVEC 2026-2030 Technician Question Pool, T5C12 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    A. The opposition to AC current flow
    Checked 2026-10-09.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Ham RadioWhat term describes the number of times per second that an alternating current makes a complete cycle?Ham RadioWhich describes alternating current?Ham RadioWhat is the unit of impedance?

That's stuff everyone should know.