I/V graph of a semiconductor diode


IV graph of semiconductor diode
IV graph of semiconductor diode

A diode is a device that has very low resistance in one direction and a very high resistance in the other direction.

  • If a potential difference is applied across a diode in the direction with low resistance, it is said to be forward bias.
  • If a potential difference is applied in the direction with very high resistance, it is said to be reverse bias.
  • If the reverse bias potential difference is too high, a diode may break down and the current becomes infinite, resulting in a short circuit.

 

diode in a circuit
Current flows in same direction as diode symbol

 


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