THERMIONIC TUBE Meaning and
Definition
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A thermionic tube, also known as a vacuum tube or valve, is an electronic device that consists of a sealed glass envelope containing various electrodes and a near-vacuum or low-pressure gas or vacuum. It operates on the principle of the thermionic emission, in which electrons are emitted from a heated cathode and controlled by the electric fields generated by the other electrodes.
The essential components of a thermionic tube include a cathode, an anode, and at least one control grid. The cathode is typically a heated filament that emits electrons when reaching a high temperature. These emitted electrons are attracted towards the anode, which is usually a plate or a metal screen, where they create an electric current. The control grid(s) are metal screens positioned between the cathode and anode that regulate the flow of electrons from the cathode to the anode by modulating the electric field within the tube.
Thermionic tubes are widely used in electronic amplification and signal processing circuits due to their ability to amplify weak signals, modify waveforms, generate oscillations, and rectify current. They were extensively used in early electronic equipment, such as radios, televisions, and computers, before solid-state electronics became predominant.
Despite being largely obsolete in modern mainstream electronics, thermionic tubes still find applications in specialized fields, including high-frequency radio transmission, high-power audio amplification, microwave transmitters, and in some niche audiophile and guitar amplifier devices.
Common Misspellings for THERMIONIC TUBE
- rhermionic tube
- fhermionic tube
- ghermionic tube
- yhermionic tube
- 6hermionic tube
- 5hermionic tube
- tgermionic tube
- tbermionic tube
- tnermionic tube
- tjermionic tube
- tuermionic tube
- tyermionic tube
- thwrmionic tube
- thsrmionic tube
- thdrmionic tube
- thrrmionic tube
- th4rmionic tube
- th3rmionic tube
- theemionic tube
Etymology of THERMIONIC TUBE
The word "thermionic" comes from the combination of two Greek roots: "therme" meaning "heat" and "ion" meaning "go". "Tube" refers to the physical shape of the device.
The term "thermionic tube" was coined in the early 20th century to describe a device that relies on the emission and conduction of electrons in a vacuum. This included early versions of vacuum tubes, such as the diode and triode, which were used in early electronic devices. These devices relied on the thermionic emission of electrons from a heated cathode, which were then conducted through a vacuum to a positively charged electrode, usually an anode, resulting in current flow.
Similar spelling words for THERMIONIC TUBE
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