Diode or diode. The definition of a diode according to Wikipedia that I understand, a diode is an electro component that has two active channels, anode and a cathode, but sometimes has three channels where the other channel only functions as a heater, where an electric current can flow in it and is usually used because of its unique nature. allows current to flow in only one direction, against the current in another.
A applied voltage can cause electrons to flow in only one direction, from cathode to anode, and then back to the cathode via an external circuit. Diodes are used primarily as rectifiers - which convert alternating current into current and to vary the amplitude of the signal in proportion to the voltage in a circuit, such as in a radio or television receiver. The best known diodes are vacuum tubes and semiconductor diodes. Semiconductor diodes, the simplest of the semiconductor devices, consist of two electrodes and two different semiconducting substances. These diodes form the basis for more complex semiconductor equipment (including transistors) used in computers and other electronic equipment. Semiconductor diodes include light emitting diodes and laser diodes, the latter emitting laser light, useful for telecommunications over optical fibers and for reading CDs.
This diode is widely used in various functions. Due to its use as a rectifier, this makes the diode a key element in converting AC to DC by limiting the flow of current in one direction. Diodes can also be used as temperature and light sensors and light emitters (LEDs). In communication equipment as well, they can filter analog and digital signals from the operator and modulate the signal to the operator. In digital logic, they are used as one-way valves and as switches similar to transistors.
Physically, this diode is in the form of a vacuum tube which is used in electronic circuits as a rectifier or radio frequency detector. Modern applications of tube diodes are generally limited to rectifiers in high-end audio amplifiers and other specialized high-voltage circuits.
The tube diode uses three channel elements, two active elements and one passive element (which acts as a heater). In a typical operation, the cathode is heated by the filament, and an AC voltage is applied to the cathode. The hot cathode releases electrons which rapidly flow to the plate (anode) and become a rectified current. In this case, this diode allows current flow to be unidirectional.
The picture above shows the physical form and electro schematic of the diode. That's a brief description of the diode. May be useful.