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Glossary of Electronics Terms
beginning with letter V
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vacuum tube
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noun
  1. (electronics) An electrical device containing a heated filament inside an evacuated container (generally a glass tube) and used to produce rectification (a diode vacuum tube), amplification or other functions.
valve
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noun
  1. A device that controls the flow of a gas or fluid through a pipe.
  2. A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
  3. (context, anatomy) A structure in the heart that controls the direction of the flow of the blood.
  4. A vacuum tube.
varactor
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noun
  1. (electronics) A solid-state diode whose capacitance varies with the applied voltage.
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