Light Emitting Diode (LED) is a component that emits light when current passes through it.

It has two terminals (leads/wires):

  • Anode (long)
  • Cathode (short)

They allow current to flow in one direction (anode to cathode). Therefore, the anode should be connected to the positive terminal and the cathode should be connected to the negative terminal.

They come in different shapes, sizes, and colors and are often used as indicators on electronic devices. On some LEDs, the cathode side of the LED has a flat edge.


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