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Which of these is commonly used as a visual indicator?

An LED is the common visual indicator on radios.

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  1. A FET
  2. An LED ✔
  3. A Zener diode

Why: An LED glows when current flows through it. Radios use LEDs for power, transmit and status lights.

Huh, didn't know that: LED stands for light emitting diode, and it is normally wired for forward current.

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Why did the LED do so well in school? It was very bright.
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References

Answer: An LED. An LED glows when current flows through it. Radios use LEDs for power, transmit and status lights.

  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
    T6D07 (A) Which of the following is commonly used as a visual indicator? A. LED
    Checked 2026-10-09.

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