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Which of these is a resonant or tuned circuit?

An inductor and a capacitor, in series or in parallel.

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  1. A linear voltage regulator
  2. An inductor and capacitor in series or parallel ✔
  3. A resistor circuit used to lower SWR

Why: Hook an inductor and a capacitor together, either in series or in parallel, and you get a tuned circuit. It responds strongly to one frequency more than others.

Huh, didn't know that: Tuned circuits are one way a receiver picks one station out of many.

The dad joke
Why was the tuned circuit so calm? It always found its own frequency.
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References

Answer: An inductor and capacitor in series or parallel. Hook an inductor and a capacitor together, either in series or in parallel, and you get a tuned circuit. It responds strongly to one frequency more than others.

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    T6D11 (A) Which of the following is a resonant or tuned circuit? A. An inductor and a capacitor in series or parallel
    Checked 2026-10-09.

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