Thermionics
noun, (used with a singular verb)
1.
the branch of physics that deals with thermionic phenomena.
noun
1.
(functioning as sing) the branch of electronics concerned with the emission of electrons by hot bodies and with devices based on this effect, esp the study and design of thermionic valves
Read Also:
- Thermionic-tube
noun, Electronics. 1. a vacuum tube in which the cathode is heated electrically to cause the emission of electrons by thermal agitation. thermionic tube (thûr’mī-ŏn’ĭk) An electrical component, typically an electron tube, through which electric current flows via the emission of thermions from a heated cathode.
- Thermionic-valve
noun, British. 1. vacuum tube. thermionic valve noun 1. an electronic valve in which electrons are emitted from a heated rather than a cold cathode
- Thermistor
noun, Electronics. 1. a resistor whose action depends upon changes of its resistance material with changes in temperature. noun 1. a semiconductor device having a resistance that decreases rapidly with an increase in temperature. It is used for temperature measurement, to compensate for temperature variations in a circuit, etc thermistor (thûr’mĭs’tər) A resistor whose resistance […]
- Thermit
Trademark. 1. a brand of thermite. noun 1. trademark a mixture of aluminium powder and a metal oxide, such as iron oxide, which when ignited reacts with the evolution of heat to yield aluminium oxide and molten metal: used for welding and in some types of incendiary bombs
- Thermite
noun 1. a mixture of finely-divided metallic aluminum and ferric oxide that when ignited produces extremely high temperatures as the result of the union of the aluminum with the oxygen of the oxide: used in welding, incendiary bombs, etc.