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Which part's schematic symbol is a circle with three leads and an arrow on one lead?

Transistor.

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  1. Resistor
  2. Indicator lamp
  3. Transistor ✔

Why: A bipolar transistor symbol shows three leads, with an arrow on the emitter. On the exam, it is component 2 in Figure T-1.

Huh, didn't know that: The emitter arrow helps identify whether a bipolar transistor is NPN or PNP.

The dad joke
Why does the transistor symbol have an arrow? So the current knows which way to go.
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References

Answer: Transistor. A bipolar transistor symbol shows three leads, with an arrow on the emitter. On the exam, it is component 2 in Figure T-1.

  1. NCVEC 2026-2030 Technician Question Pool, T6C03 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. Transistor
    Checked 2026-10-09.

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