AUTOMATIC STREET LIGHT CONTROL SYSTEM (MINOR …
5.4 . LED (LIGHT EMITTING DIODE) A light-emitting diode (LED) is a two-lead semiconductor light source that resembles a basic pn-junction diode, except that an LED also emits light. When an LED's anode lead has a voltage that is more positive than its cathode lead by at least the LED's forward voltage drop, current flows.
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