an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents.
an electrical device, such as a valve, in which a flow of electrons between electrodes takes place Also called vacuum tube Sometimes shortened to tube
A sealed glass tube containing either a vacuum or a small amount of gas, in which electrons move from a negatively charged electrode, the cathode, to a positively charged one, the anode. The cathode is usually heated by an electric current to free the electrons. Other electrodes in the tube can vary the electric or magnetic fields in the tube to control the strength and direction of the moving electrons. Electron tubes are used to amplify signals, rectify AC currents, and produce x-rays, among other uses. They have been mostly replaced by transistors but are still used in television screens, computer monitors, and microwave technology. Also called valve. See also vacuum tube.
noun, Biochemistry. 1. the stepwise transfer of electrons from one carrier molecule, as a flavoprotein or a cytochrome, to another along the respiratory chain and ultimately to oxygen during the aerobic production of ATP. noun 1. (biochem) the metabolic process in mitochondria or chloroplasts, in which electrons are transferred in stages from energy-rich compounds to […]
[ih-lek-tron-vohlt] /ɪˈlɛk trɒnˌvoʊlt/ noun, Physics. 1. a unit of energy, equal to the energy acquired by an electron accelerating through a potential difference of one volt and equivalent to 1.602 × 10 −19 joules. Abbreviation: eV, ev. /ɪˌlɛktrɒnˈvəʊlt/ noun 1. a unit of energy equal to the work done on an electron accelerated through a […]
[ih-lek-tron-vohlt] /ɪˈlɛk trɒnˌvoʊlt/ noun, Physics. 1. a unit of energy, equal to the energy acquired by an electron accelerating through a potential difference of one volt and equivalent to 1.602 × 10 −19 joules. Abbreviation: eV, ev.
electronystagmography e·lec·tro·nys·tag·mog·ra·phy (ĭ-lěk’trō-nĭs’tāg-mŏg’rə-fē) n. Abbr. ENG A study of the recorded changes in corneoretinal potential caused by movements of the eye, used to assess nystagmus.