A cold cathode is a cathode, an electrode that emits electrons, which is not electrically heated by a filament. They are 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 a filament which has electric current passing through it. 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.
Read more about Cold Cathode: Cold-cathode Devices, Lamps, Details
Famous quotes containing the word cold:
“For, brother, know that this is art, and you
With a cold incautious sorrow stricken dumb,
Have your own vanishing slit of light let through,
Passionate as winter, where only a few may come:
Not idiots in the street find out the lees
In the last drink of dying Socrates.”
—Allen Tate (1899–1979)