electro-, electr-, electri-
(Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity)
Electronics in our lives consists of numerous tools
Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.
2. The study of the motion of free electrons under the influence of electric and magnetic fields; as in laser technology, light amplificaion, and photoelectricity.
3. The science that deals with the direction, deflection, or focusing of beams of electrons by electric and magnetic fields; such as, in electron lenses.
4. The science of the control of electron motion by electron lenses in systems or under conditions analogous to those involving or affecting visible light.
5. A branch of electronics concerned with the behavior of the electron beam under the influence of electrostatic and electromagnetic forces.
6. The science of the emission and propagation of electrons and of the factors controlling and modifying their flow; especially, when applied to electron microscopy.
7. The science and technology concerned with the use of applied electrical fields to generate and to control optical radiation.
The term electron-optics is often used erroneously as a synonym for optoelectronic.
2. A pair of valence electrons that form a non-polar bond between two neighboring atoms.
2. A chemical bond between two atoms of the same or different elements, in which each atom contributes one electron to be shared in a pair.
2. Magnetic resonance arising from the magnetic moment of unpaired electrons in a paramagnetic substance or in a paramagnetic center in a diamagnetic substance (a group of substances which in a magnetic field become magnetic in an opposite direction to that of iron or relating to a substance that is repelled by a magnet).
2. Paramagnetism in a substance in which atoms or molecules possess a net electronic magnetic moment.
It arises because of the tendency of a magnetic field to orient the electronic magnetic moments parallel to itself.
A magnetic moment refers to a vector associated with a magnet, current loop, particle, etc., whose cross product with the magnetic induction (or alternatively, the magnetic field strength) of a magnetic field is equal to the torque exerted on the system by the field.
2. An annular vacuum chamber, enclosed by bending and focusing magnets, in which counter-rotating beams of electrons and positrons are stored for several hours and can be made to collide with each other.
2. An analytical technique used to determine the nature of extremely small samples by forming the x-ray spectrum of the samples through excitation by a finely focused electron beam.
3. Identification and measurement of elements and their location based on the fact that x-rays emitted by an element excited by an electron beam have a wavelength characteristic of that element and an intensity related to its concentration.
It is performed with an electron microscope fitted with an x-ray spectrometer, in a scanning or transmission mode.
2. A small cathode-ray tube having a fluorescent pattern whose size varies with the voltage applied to the grid.
It is used in radio receivers to indicate the accuracy of tuning and as a modulation indicator in some tape recorders.
2. A special-purpose electron tube in which electrons are accelerated by high-voltage anodes, formed into a beam by focusing electrodes, and projected toward a phosphorescent screen that forms one face of the tube.
To form a display, or image, on the screen, the electron beam is deflected in the vertical and horizontal directions either by the electrostatic effect of electrodes within the tube or by magnetic fields produced by coils located around the neck of the tube.3. A type of recording-level indicator using a luminous display in a special tube.
The display is usually like an "eye" with a keyhole in the middle, and the maximum recording level corresponds to the closing-up of a slot at the bottom of the keyhole which is superseded by meters in current-model recorders.