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WBCS Preliminary Examination 2015 — General Studies · Question 91 of 200

Q91
General SciencePhysics
LED stands for
  1. a.Light emitting device
  2. b.Light emitting diode
  3. c.light encapsulated device
  4. d.light emitting dots

Answer: (B) Light emitting diode

LED stands for Light Emitting Diode. A diode is a semiconductor device that allows current to flow in one direction; when current flows through an LED, electrons recombine with electron holes and release energy in the form of photons (light). LEDs are far more energy-efficient than incandescent bulbs.

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