LED is the acronym for which of the following?

• A. Light Emitter Diode
• B. Light Emitting Diode
• C. Laser Emitting Diode
• D. Light Efficient Diode

Answer: (B)

Knowing how LEDs are named helps here: the acronym describes what the device is and what it does. LED stands for Light Emitting Diode. The word Light tells you what the device outputs. Emitting describes the process—the diode releases photons when current flows through it. Diode identifies the basic electrical structure, a semiconductor p-n junction that conducts in one direction. So the term captures a light-producing, emitting device built as a diode.

The other phrasings aren’t the established term. Light Emitter Diode uses a noun in place of the active form, which isn’t the standard name. A Laser Emitting Diode would imply laser action and coherent light, which is different from a typical LED. Light Efficient Diode isn’t a recognized designation for this device.