a cathode emits electrons
1cathode-raytube — cath·ode ray tube (kăthʹōd rā ) Precision Graphics n. Abbr. CRT A vacuum tube in which a hot cathode emits electrons that are accelerated as a beam through a relatively high voltage anode, further focused or deflected electrostatically or… …
2Cathode ray — Cathode rays (also called an electron beam or e beam) are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode)… …
3Cathode — Diagram of a copper cathode in a galvanic cell (e.g., a battery). A positive current i flows out of the cathode (CCD mnemonic: Cathode Current Departs). A cathode is an electrode through which electric current flows out of a polarized electrical… …
4cathode-ray tube — noun a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen • Syn: ↑CRT • Hypernyms: ↑gas discharge tube • Hyponyms: ↑Crookes tube …
5cathode — /ˈkæθoʊd / (say kathohd) noun 1. the electrode which emits electrons or gives off negative ions and towards which positive ions move or collect in electrolysis, a radio valve, semiconductor diode, etc. 2. the negative pole of a battery or other… …
6Hot cathode — is also a name for a hot filament ionization gauge, a vacuum measuring device.In vacuum tubes, a hot cathode is a cathode electrode which emits electrons due to thermionic emission. ( Cf. cold cathodes, where field emission is used and which do… …
7cold cathode — Electronics. a cathode, in an electron tube (cold cathode tube) or lamp, that emits electrons without having to be heated. [1925 30] * * * …
8cold cathode — noun Electronics a cathode that emits electrons without being heated …
9luminescence — luminescent, adj. /looh meuh nes euhns/, n. 1. the emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies. 2. the light produced by such an emission. [1885 90; < L lumin (see LUMEN) +… …
10Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
