The light-emitting diode (LED):
A) Emits light when it is reverse biased.
B) Has a variable turn-on voltage.
C) Has a light color that is defined by the materials used to construct the diode.
D) Has a turn-on voltage that is usually less than standard diodes.

Question

Quizplus · Accepted Answer

The light color of an LED is determined by the materials used to construct it, specifically the bandgap of the semiconductor material. LED's emit light when they are forward biased, not reverse biased, making option A incorrect. While the turn-on voltage of an LED may vary slightly depending on the specific device, it is generally higher than that of a standard diode, making option D incorrect.

The Light-Emitting Diode (LED)