Which of the pictured solid state semiconductor devices is a light-emitting diode? EL-0068
Official USCG Answer & Rule Citation
Correct Answer: Option D — 7
A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when forward-biased. Standard marine electrical diagrams designate LEDs with specific symbols showing radiating light arrows, distinguishing them from standard rectifiers and Zener diodes.
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