SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-diode-one-direction

What electronic component allows current to flow in only one direction?

A diode, the one-way valve of electronics.

  1. Diode ✔
  2. Resistor
  3. Fuse

Why: A diode lets current pass easily one way and blocks it the other way, like a check valve in a water pipe.

Huh, didn't know that: A light-emitting diode, or LED, glows when forward current flows through it.

The dad joke
Why are diodes so bad at arguments? They only see things one way.
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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.