What is a diode?

Alexander Smaznev
Alexander Smaznev
January 27, 2015
11348
What is a diode?

Often we hear that this or that device works on diodes. What is a diode?

A diode is an electronic element that passes current well in one direction and provides strong resistance when trying to pass current through it in the opposite direction.

How are modern diodes

Currently used diodes of the semiconductor type of germanium or silicon. Such a diode is a plate, divided into two parts. In one part artificially created a lack of electrons. This is a region with p-type conductivity (from the word positive). The positive lead from the diode is called the anode.

In the other part there is an excess of electrons. This is an area with n-type conductivity (from the word negaive). The negative contact of the diode is called a cathode.

The boundary between these areas is called the pn junction.

How does the diode

If the positive pole of the power source is connected to the anode of the diode, and negative to the cathode, an electric current will flow through such a circuit. If the circuit also includes a light bulb, it will light up.What will the diode do if the positive and negative power supply contacts are swapped? It will provide strong current resistance. The current will become so weak that the light will not burn.

What are diodes for?

The main field of application of diodes is the conversion of alternating current into direct current. Diode - the main structural element of all power supplies, including the one that is now on your computer.

Also, diodes are widely used in logic circuits, in which it is necessary to ensure the passage of current in the right direction. Such circuits are used in analog type devices.