LED stands for light-emitting diode. A diode is a device made from two different conducting materials that allows current to flow in only one direction. When electricity is passed through the diode, the atoms in one material are excited to a higher energy level. This energy is released as the atoms transfer electrons to the other material. During this energy release light is created. The colour of the light from the LED depends on what the diode is made from and how it is configured.
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