Plate electrode
Encyclopedia
A plate is a type of electrode
Electrode
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit...

 that formed part of a vacuum tube
Vacuum tube
In electronics, a vacuum tube, electron tube , or thermionic valve , reduced to simply "tube" or "valve" in everyday parlance, is a device that relies on the flow of electric current through a vacuum...

. The plate is impressed with a positive charge so that it may capture and flow electron
Electron
The electron is a subatomic particle with a negative elementary electric charge. It has no known components or substructure; in other words, it is generally thought to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton...

s within a circuit.
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