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electromagnetics (used with a sing. verb) the branch of physics that concerns the relationship between magnetism and electricity; electromagnetism.
electromagnetic spectrum the entire range of electromagnetic frequencies from radio, the lowest, to gamma rays, the highest.
electromagnetic wave a wave that contains a magnetic and electric component and that is created by an accelerating electric charge, such as a radio wave, x-ray, or light.
electromagnetism magnetism produced by electric current. [2 definitions]
electrometer an instrument used to measure the difference in electrical potential between two objects.
electromotive of, pertaining to, or producing a flow of electricity.
electromotive force the force that causes electrical current to flow, usu. measured in volts.
electron a negatively charged particle, considered a fundamental unit of matter, that exists independently or outside the nucleus of an atom.
electronegative having a negative electric charge. [2 definitions]
electron gun the electron-emitting cathode in a cathode ray tube together with the electromagnetic apparatus that collects and focuses the electron stream.
electronic of or relating to devices, circuits, or systems based on electronics. [2 definitions]
electronic data processing the use of computers to process and store information.
electronic mail messages typed into a computer terminal and sent via telephone cable to another terminal.
electronic music music that is produced electronically by an instrument such as a synthesizer.
electronic organ a musical instrument that resembles a pipe organ in its keyboard and stops, but produces music electronically rather than through pipes.
electronics (used with a sing. verb) the science that is concerned with the flow of electrons in various physical media, and with their properties and uses.
electron lens an electric or magnetic field, or a combination of the two, that is used to focus or deflect an electron beam.
electron microscope any of various microscopes that use electrons rather than rays of light to magnify the image of the object being viewed.
electron tube a sealed, tube-shaped container in which a pair of electrodes controls the flow of electrons through a vacuum or very low-pressure gas.
electron-volt a unit of energy equal to the energy of one electron accelerated by one volt, or equal to 1.602 times 10-12 erg.
electrophoresis the motion of particles, esp. colloids, in a relatively stationary fluid due to the influence of an electric field, usu. provided by immersed electrodes; cataphoresis.