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:
“To watch that world come up like a cold sun,
Rewarding others, is my liberty.
Not to prevent it is my will’s fulfilment.
Willing it, my ailment.”
—Philip Larkin (1922–1986)