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 1. the process of voting or or of counting votes by any of various electronic means: the use of optical scanners in electronic voting.
- Electronic warfare
noun 1. the military use of electronics to prevent or reduce an enemy’s effective use and to protect friendly use of electromagnetic radiation equipment
- Electronic waste
noun See e-waste
- Electronic whiteboarding