What exactly does a diode do?

I am a beginner.
So what should I make of diodes, which are supposed to make the current flow only in one direction?
Please explain briefly. 

06-Dec-2015 11:21 PM

Answers (1)


As you said, the main property of a diode is that it blocks the current in one direction, and allows the current to flow in the other direction. Now, this property could be used in various applications, and functions; the most common, being, to be used as a Rectifier. With different properties of diodes, such as forward current voltage, junction, etc., different types of diodes could be used for different purposes.

For, example, 

  • Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits.
  • Schottky diodes are widely used as clamping diodes, in RF applications, and also for rectifier applications.
  • Photodiode is used for detecting light. It is found that when light strikes a PN junction it can create electrons and holes. 

07-12-2015 15:40

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