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SESK: Stuff Everyone Should Know · sesk.info/ham-capacitor-electric-field

What electrical component stores energy in an electric field?

A capacitor, made of conductive plates separated by an insulator.

  1. Capacitor ✔
  2. Inductor
  3. Resistor

Why: A capacitor holds energy in the electric field between its plates. An inductor stores energy in a magnetic field instead, and a resistor turns energy into heat.

Huh, didn't know that: Filter capacitors can still hold a dangerous charge right after a power supply is turned off.

The dad joke
Why did the capacitor kiss the diode? He just couldn't resist.
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Sources

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 release) https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

Test yourself in the game

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That's stuff everyone should know.