Cold cathode
Type of electrode and part of cold cathode fluorescent lamp. / From Wikipedia, the free encyclopedia
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This article is about light sources and indicators. For cold cathode ion sources, see Ion source.
A cold cathode[1] is a cathode that is not electrically heated by a filament.[note 1] A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. It is used in gas-discharge lamps, such as neon lamps, discharge tubes, and some types of vacuum tube. The other type of cathode is a hot cathode, which is heated by electric current passing through a filament. A cold cathode does not necessarily operate at a low temperature: it is often heated to its operating temperature by other methods, such as the current passing from the cathode into the gas.
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