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cathode Definition

cath·ode (kat̸h′ōd′)

noun

  1. in an electroplating cell, the negatively charged electrode, from which current flows
  2. in an electron tube, the negatively charged electron emitter
  3. in a battery that is a source of electric current, as a dry cell or storage battery, the positive electrode which receives the electrons from the external circuit

Etymology: coined by Michael Faraday < Gr kathodos, descent < kata-, down + -ode

cathode Related Forms
ca·thod′ic (ka t̸häd′ik) adjective
cathode Usage Examples

Preposition: of

  • diode: In this the cathode of the diode is earthed and the top of the output waveform is clamped to zero volts.

Converse of object

  • focus: Months ago is the march session focusing the cathode.
  • use: The model is applied in evaluation of a remote virtual cathode system for use with the display using thermionic filament cathodes.
  • make: In this way, all of the current through the valve works with the resistors to make the cathode slightly positive.
  • have: Back to the lights - I have some old maplin cathodes left over from times yonder.

Adjective modifier

  • cold: With TWO UV cold cathodes lighting up the UV reactive acrylic panel evenly.
  • negative: On passing a low d.c. voltage the metal is deposited on the conducting negative cathode.
  • blue: I have on blue cold cathode and it is sufficient for a window of this size.
  • hollow: A copper cold finger, attached to a hollow copper cathode, is cooled using liquid nitrogen.
  • heated: In the Coolidge tube, the bulb could be completely evacuated and electrons were liberated from a heated spiral cathode.
  • nice: Maybe a nice cathode or 5 in there to make it shiney too:D.

Modifies a noun

  • ray: The front glass: a section of a sphere Previous cathode ray tubes were curved for a good reason.
  • oscilloscope: He had the idea in 1916 of using cathode ray oscilloscopes to do this, but this did not come to fruition until 1923.
  • tube: The front glass: a section of a sphere Previous cathode ray tubes were curved for a good reason.
  • resistor: If the IF amplifier valve has a cathode bias resistor, check it's on value.
  • electrode: You may require a small toroidal shape magnet in front of the cathode electrode in order to focus the electron stream into a beam?
  • voltage: If it all seems OK but there's nothing going on in the speaker, check the output valve's cathode voltage.

Noun used with modifier

  • copper: A copper cold finger, attached to a hollow copper cathode, is cooled using liquid nitrogen.
  • waste: ICER - Materials recovery from waste cathode ray tubes ( CRTs ).
  • carbon: The carbon cathode is added, and the rod inserted, pushing the paper against the walls of the cans.