Thermionic emission If a tungsten filament is heated to about 2000 o C, some of the electrons have sufficient kinetic energy to escape from the surface. - ppt download
Thermionic Emission - Working & Its Applications - Semiconductor for You
History Of The Diode | Hackaday
Thermionic Diodes - Electrons in Technology
Fleming valve - Wikipedia
Thermionic Emission | SPM Physics Form 4/Form 5 Revision Notes
schoolphysics ::Welcome::
16 Thermionic Diode Photos and Premium High Res Pictures - Getty Images