Light emitting diodes Circuit, Working Principle and ... Working Principle of LED. The working principle of the Light emitting diode is based on the quantum theory. The quantum theory says that when the electron comes down from the higher energy level to the lower energy level then, the energy emits from the photon. The photon energy is equal to the energy gap between these two energy levels. How Light Emitting Diodes Work | HowStuffWorks The lifespan of an LED surpasses the short life of an incandescent bulb by thousands of hours. Tiny LEDs are already replacing the tubes that light up LCD HDTVs to make dramatically thinner televisions. Light Emitting Diode (LED) Working,Circuit Symbol ... How a LED works – Light Emitting Diode working. Free electrons are in the conduction band of energy levels, while holes are in the valence energy band. Thus the energy level of the holes will be lesser than the energy levels of the electrons. Some part of the energy must be dissipated in order to recombine the electrons and the holes. This energy is emitted in the form of heat and light. Light Emitting Diode | How Does a LED Work | Electronics Notes How a light emitting diode works . The light emitting diode emits light when it is forward biased. When a voltage is applied across the junction to make it forward biased, current flows as in the case of any PN junction. Holes from the p type region and electrons from the n type region enter the junction and recombine like a normal diode to enable the current to flow. Light Emitting Diode working, construction, types and ... Working Principle Light Emitting Diode. The light LED works on the same principle of simple PN junction diode means when the anode is connected to positive terminal of dc supply and cathode is connected to the negative terminal of dc supply then the PN junction is forward biased.

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techno tech multimeter tutorial how to test led

techno tech multimeter tutorial how to test led

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