Encyclopedia

Electrical system of the International Space Station Electrical power is the most critical resource for the International Space Station because it allows the crew to live comfortably, to safely operate the station, and to perform scientific experiments. One method of harnessing solar power, called photovoltaics, uses purified silicon solar cells to directly convert light to electricity.
Electrical Safety Office The Queensland Government's Electrical Safety Office (ESO) is part of the Queensland State Government's Department of Industrial Relations. It develops and implements legislative, compliance and enforcement frameworks to improve electrical safety in Queensland.
Electrical termination Electrical termination of a signal involves providing a terminator at the end of a wire or cable to prevent an RF signal from being reflected back from the end, causing interference. The terminator is placed at the end of a transmission line or daisy chain bus (such as in SCSI), designed to match impedance and hence minimize reflections of the signal.
Electrical treeing Within the field of electrical engineering, treeing is a process whereby branching channels, or chains of small fractures, are created within, or on the surface of, a solid dielectric material as a result of cumulative partial discharges.
Electrical tuning Electrical tuning is a mechanism by which vertebrates such as frogs and reptiles, which lack a long cochlea, discriminate sound. Mammals have long cochleae, and are able to distinguish different sounds by mechanisms such as mechanical tuning, in which the stiffness and length of hair cells’ stereocilia makes a given cell best suited to respond to a certain type of stimulus.
Electrical Trades Union of Australia The Electrical Trades Union of Australia (ETU) is a trade union in Australia which has a history stretching back over 100 years. In its modern form the ETU is a division of the Communications, Electrical and Plumbing Union (CEPU), although it is possibly the most well known of the three divisions.
Electrical wiring Electrical wiring in general refers to insulated conductors used to carry electricity, and associated devices. This article describes general aspects of electrical wiring as used to provide power in buildings and structures, commonly referred to as house or building wiring.
Electrical wiring (UK) The modern UK standards and regulations for electrical wiring no longer differ substantially from those in other European countries. However, there are a number of noteworthy national peculiarities, habits and traditions associated with domestic electrical wiring in the UK (and Ireland) that differ significantly from other countries.
Electrical wiring (United States) Electrical wiring in general refers to conductors used to carry electricity and their accessories. General aspects of electrical wiring as used to provide power in or to buildings and structures, commonly referred to as building wiring, are described in Electrical wiring.
Electrician An electrician is a tradesman specializing in electrical wiring of buildings and related equipment. Electricians may be employed in the construction of new buildings or maintenance of existing electrical infrastructure.
Electrician (theater) In theater, the term Electrician is generally applied to those that work with the various aspects of lighting. Some of the positions included among Electricians include the Lighting Supervisor, Master Electrician, Deck Electrician, Light Board Operator, Moving Light Programmer, Followspot Operator, as well as simply Electricians.
Electricity Electricity (from Greek ήλεκτρον (electron) "amber") is a general term for the variety of phenomena resulting from the presence and flow of electric charge. Together with magnetism, it constitutes the fundamental interaction known as electromagnetism.
Electricity Act 1947 (UK) The Electricity Act 1947 was an act of the parliament of the United Kingdom that nationalised the numerous municipal and privately-owned electricity generation and supply utilities in Great Britain. They were replaced with a British Electricity Authority and fourteen Area Electricity Boards.
Electricity Commission (UK) The Electricity Commission was a government department that oversaw the UK's electricity supply industry from 1919 until nationalisation] in [[1947. It considered standardization of frequency, regulations for overhead lines, the relative efficiency of gas and electricity and cases of interconnection overseas.
Electricity Corporation of New Zealand The Electricity Corporation of New Zealand Ltd (ECNZ) is a New Zealand State-Owned Enterprise formed on April 1, 1987 as a transition entity in the process of deregulating the New Zealand Electricity Market. ECNZ is now a residual entity that manages ECNZ's remaining hedge and debt obligations whilst winding up ECNZ's other activities.
Electricity distribution Electricity distribution is the penultimate stage in the delivery (before retail) of electricity to end users. It is generally considered to include medium-voltage (less than 50 kV) power lines, electrical substations and pole-mounted transformers, low-voltage (less than 1000 V) distribution wiring and sometimes electricity meters.
Electricity in India Electric power generation in India is done mostly by government sector entities, and are controlled by various central public sector corporations, like National Hydroelectric Power Corporation, National Thermal Power Corporation and various state level corporations (state electricy boards - SEBs). The transmission and distrubition is by the State Electricity Boards (SEBs) or private companies.
Electricity in New Zealand Electricity is the number one energy source used in New Zealand, derived from hydroelectric generation, burning Natural Gas, burning Coal, burning Oil, converting Wind and Thermal energy. Burning Bio-Waste emissions from land-fills is starting to take hold.
Electricity liberalization Electricity liberalization refers to the liberalization of electricity markets. As electricity supply is a natural monopoly, this entails complex and costly systems of regulation to enforce a system of competition.
Electricity market An electricity market is a system for effecting the purchase and sale of electricity using supply and demand to set the price. Wholesale transactions in the physical commodity are typically cleared and settled by the grid operator or a special-purpose independent entity charged exclusively with that function.
Electricity provider switching Electricity provider switching is the ability of power consumers to have an option -- or the "power to choose" -- their electricity provider in a deregulated electricity market as permitted by a state public utilities governing body.
Electricity Supply Board The Electricity Supply Board (ESB) (Bord Soláthair an Leictreachais in Irish), sometimes called ESB Ireland to differentiate it from US utilities, is responsible for generating and transmitting most of the electricity in the Republic of Ireland.
Electricity Supply Industry Reform Unit The Electricity Supply Industry Reform Unit (ESIRU) was established by the Victorian Government in 1994 within the Office of State Owned Enterprises in the Departmenf of Treasury and Finance to advise the Government of Victoria (Australia) on the reform of Victoria's electricity industry in particular the SECV. ESIRU's tasks included a worldwide analysis of the Electricity Supply Industry (ESI) the development of a set of appropriate recommendations for electricity industry reform and project managing the implementation of the reforms.
Electricity Trust of South Australia The Electricity Trust of South Australia (ETSA) was the South Australian Government-owned monopoly electricity provider. Its controversial privatisation in 1999 was one of the most important political events in recent South Australian history.
Electrification Electrification refers to changing a thing or system to operate using electricity. A more specific usage of the word refers to the act or process of building the necessary infrastructure to supply electric power to homes and businesses, especially in rural and isolated areas or the changeover of a railway from in the past steam locomotives, but now most often diesel-powered locomotives to electric locomotives.
Electrified water cannon The electrified water cannon was a non-lethal weapon under early research by Jaycor Tactical Systems, as part of a program to produce non-lethal weapons for law enforcement officers. It is sometimes referred to as the electrocuting water cannon; however, the proposal was for low current, high voltage pulses like those produced by a conventional stun gun, which do not cause electrocution.
Electro (music) Electro, short for electro funk (also known as robot hip hop and Electro hop) is an electronic style of hip hop directly influenced by Kraftwerk and funk records (unlike earlier rap records which were closer to disco). Records in the genre typically have electronic sounds and some vocals are delivered in a deadpan, mechanical manner often through a vocoder or other electronic distortion.
Electro house Electro house (also known as electronic house, dirty house, and often shortened to simply "electro") is a subgenre of house music that rose to become one of the foremost genres of electronic dance music in 2004-6. Stylistically, it takes the 4/4 beats and moderate tempo of 'normal' house and adds harmonically rich analogue basslines, abrasive high-pitched leads and the occasional old-school piano or string riff.
Electro chemical machining Electro Chemical Machining (or ECM) is a method of working extremely hard materials or materials that are difficult to machine cleanly using conventional methods. It is limited, however, to electrically conductive materials.
Electro quarterstaff Electro Quarterstaff is a Heavy Metal band hailing from Winnipeg, Manitoba, Canada. They play an intensely virtuosic form of instrumental Progressive Metal Technical Metal and are unique in that they employ three guitars and no bass.
Electro Slag Remelting ESR or electro slag remelting (also known as electro flux remelting) is a process used for remelting and refining of steels and special alloys which are used for critical applications in aircraft, thermal and nuclear power plants, defence hardware, etc.
Electro-gravitic propulsion In pseudophysics, electro-gravitic propulsion refers to claims made at certain websites regarding supposed devices which could be used to drive a spacecraft. Some websites which promulgate these claims sometimes include the additional claims that UFOs are alien spacecraft and are operated by such alleged devices.
Electro-optic effect The electro-optic effect is a change in the optical properties of a material in response to an electric field that varies slowly compared with the frequency of light. The term encompasses a number of distinct phenomena, which can be subdivided into
Electro-optic modulator Electro-optic modulator (EOM) is an optical device in which a signal-controlled element displaying electro-optic effect is used to modulate a beam of light. The modulation may be imposed on the phase, frequency, amplitude, or direction of the modulated beam.
Electro-optics Electro-optics is a branch of technology involving components, devices and systems which operate by modification of the optical properties of a material by an electric field. Thus it concerns the interaction between the electromagnetic (optical) and the electrical (electronic) states of materials.
Electro-osmosis In electrochemistry and physics, electro-osmosis, also called electroendosmosis, is the motion of polar liquid through a membrane or other porous structure (generally, along charged surfaces of any shape and also through non-macroporous materials which have ionic sites and allow for water uptake, the latter sometimes referred to as "chemical porosity" ) under the influence of an applied electric field.
Electro-Optix Electro-Optix is a corporation that designs, manufactures, and distributes magnifiers, thermometers and optical inspection tools. Established in 1964, Electro-Optix is a privately owned company with offices in the U.
Electro-pneumatic action The electro-pneumatic action is a control system for pipe organs, whereby air pressure, controlled by an electric current and operated by the keys of an organ console, opens and closes valves within wind chests, allowing the pipes to speak. This system also allows the console to be physically detached from the organ itself.
Electro-Theremin The Electro-Theremin is a electronic musical instrument developed by trombonist Paul Tanner and amateur inventor Bob Whitsell in the late 1950s to produce a sound to mimick that of the theremin. The instrument features a tone and portamento similar to that of the theremin (or thereminvox), but with a different control mechanism.
Electroacupuncture Electroacupuncture is a form of acupuncture in which acupuncture needles are attached to a device that generates continuous electric pulses, generating a small electric current that flows between pairs of needles. Another term is Percutaneous Electrical Nerve Stimulation (PENS).
Electroacupuncture according to Voll Electroacupuncture according to Voll (EAV), also known as electrodermal screening (EDS), bioelectric functions diagnosis (BFD), bio resonance therapy (BRT), or bio-energy regulatory technique (BER), is a controversial alternative medicine method of using electrodiagnostic devices to diagnose and treat "energy imbalance" often using homeopathic products, first used by Reinhold Voll by combining acupuncture with galvanometer in 1958. It is not used in conventional medical treatments and has no scientific basis.
Electroadhesion Electroadhesion is the term given to the electrostatic effect of astriction between two surfaces subjected to an electrical field. Applications include the retention of paper on plotter surfaces, astrictive robotic prehension (electrostatic grippers) etc.
Electroantennography Electroantennogram or EAG is a technique by which we measure the average output of the antenna to the brain for a given odor. It is commonly used in the electrophysiology while studying the function of olfactory pathway in insects.
Electrocardiogram An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which records the electrical activity of the heart over time. Understanding the various waves and normal vectors of depolarization and repolarization yields important diagnostic information.
Electroceramics While ceramics have traditionally been admired for their mechanical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Such materials are now classified under Electroceramics, as distinguished from other functional ceramics such as advanced structural ceramics.
Electroclash Electroclash describes a style of fashion, music, and attitude that fuses New Wave, punk, & electronic dance music with somewhat campy and absurdist post-industrial detachment in addition to vampy and/or camp sexuality. The movement combines the 1980s electropop/New Wave/Italo disco sound by means of synthesizers and drum machines.
Electrocompaniet Electrocompaniet is a Norwegian manufacturer of high-end audio products. Widely recognized as one of the top five high-end manufacturers in the world by audiophiles , their philosophy of the perfect sound has been controversial over their 30 years of history.
Electroconvulsive therapy Electroconvulsive therapy (ECT), also known as electroshock treatment, is a controversial medical treatment involving the induction of a seizure in a patient by passing electricity through the brain. Patients with any of several conditions often show dramatic short-term improvement after the procedure.
Electrocorticography Electrocorticography (ECoG) is the practice of using an electrode placed directly on the brain to record electrical activity directly from the cerebral cortex. By placing the electrode directly onto the cortical grey matter one can record signals from neurons much more effectively than through electroencephalography (EEG).
Electrocrass Electrocrass is an early 2005 phenomenon and is considered a subcategory of the broader electronic music style, electroclash. This style of music is characterized by blatantly and unapologetically sexual lyrics, lo-fi sounding synthesizer-crafted beats, and a blend of rap-like lyrics with more traditional and irreverent pop delivery.
Electrocutionist Electrocutionist (February 24, 2001 - September 9, 2006) was a Thoroughbred racehorse. He was owned by Earle Mack, United States Ambassador to Finland and a member of the Board of Directors of the New York Racing Association.
Electrocyclic reaction In organic chemistry, an electrocyclic reaction is a type of pericyclic rearrangement reaction where the net result is one pi bond being converted into one sigma bond. These reactions are usually unnamed, being categorized by the following criteria:
ElectroCop Electrocop developed by Epyx was one of the first games developed for the Atari Lynx, and was released with the platform's launch. The gist of the game was as follows: The Criminal Brain has kidnapped the President's daughter and you have to go save her.
Electrode line Under an electrode line one understands the line connection from the static inverter plant of a high voltage direct current transmission from to the grounding electrode (cathode or anode). The grounding electrode is for the prevention of electro-chemical corrosion and for the avoidance of electromagnetic influence always some kilometers away from the static inverter station, so for this a separate line connection is necessary.
Electrodeless lamp In contrast with all other electrical lamps that use electrical connections through the lamp envelope to transfer power to the lamp, in electrodeless lamps the power needed to generate light is transferred from the outside of the lamp envelope by means of (electro)magnetic fields. There are two advantages of eliminating electrodes.
Electrodialysis Electrodialysis (ED) is used to transport salt ions from one solution through ion-exchange membranes to another solution under the influence of an applied electric potential difference. This is done in a configuration called an electrodialysis cell.
Electrodialysis reversal EDR desalination is an electrodialysis reversal desalination membrane process that has been commercially used since the early 1960s. An electric current migrates dissolved salt ions, including fluorides, nitrates and sulfates, through an electrodialysis stack consisting of alternating layers of cationic and anionic ion exchange membranes.
Electrodipping force The electrodipping force is a force proposed to explain the observed attraction that arises among small colloidal particles attached to an interface between immiscible liquids. The particles are held there by surface tension.
Electrodynamic tether Electrodynamic tethers are long conducting wires, such as the one deployed from the tether satellite, which can operate on electromagnetic principles as generators, by converting their kinetic energy to electrical energy, or as motors, converting electrical energy to kinetic energy. Electric potential is generated across a conductive tether by its motion through the Earth's magnetic field.
Electroejaculation Electroejaculation is a procedure used to obtain semen samples from sexually mature male mammals. The procedure is applied for breeding programs and research purposes in various species, as well as in the treatment of anejaculation and ejaculatory dysfunction in human males.
Electroencephalography Electroencephalography is the neurophysiologic measurement of the electrical activity of the brain by recording from electrodes placed on the scalp or, in special cases, subdurally or in the cerebral cortex. The resulting traces are known as an electroencephalogram (EEG) and represent an electrical signal (postsynaptic potentials) from a large number of neurons.
Electrofax An electrofax is an electrostatic printer and copier technology where the image is formed directly on the paper, instead of first on a drum (and then transferred to paper) as it would be in Xerography. It was used in the United States from the 1950s through the 1980s.
Electroforming Electroforming is a highly specialized process of metal part fabrication using electrodeposition in a plating bath over a base form or mandrel which is subsequently removed. Technically, it is a process of synthesizing a metal object by controlling the electrodeposition of metal passing through an electrolytic solution onto a metal or metallized form”(http://www.
Electrofringe Electrofringe is a festival of digital, electronic and new media arts. Its focus is on emergent forms and techniques within media based arts practice and places a particular emphasis on encouraging young and emerging artists to interact with established artists.
Electrogas welding Electrogas welding (EGW) is a continuous vertical position arc welding process developed in 1961, in which an arc is struck between a consumable electrode and the workpiece. A shielding gas is sometimes used, but pressure is not applied.
Electrogastrogram An electrogastrogram (EGG) is similar in principle to an electrocardiogram (ECG) in that sensors on the skin detect electrical signals indicative of muscular activity within. Where the electrocardiogram detects muscular activity in various regions of the heart, the electrogastrogram detects the wave-like contractions of the stomach (peristalsis).
Electrogravitic tensor In general relativity, the tidal tensor or electrogravitic tensor is one of the pieces in the Bel decomposition of the Riemann tensor. It is physically interpreted as giving the tidal stresses on small bits of a material object (which may also be acted upon by other physical forces), or the tidal accelerations of a small cloud of test particles in a vacuum solution or electrovacuum solution.
Electrohydraulic manual transmission Electrohydraulic manual transmission or clutchless manual gear system is a manual transmission system that appears like an automatic transmission to the user. The system automatically changes gear and handles the clutch during gear changes.
Electrohydrodynamic thruster EHD thruster stands for electrohydrodynamic thruster. This is the general and most appropriate term used for high voltage devices that propel air or other fluids, to achieve relative motion between the propulsion device and the propelled fluid.
Electrohydrodynamics Electrohydrodynamics (EHD), also known as electro-fluid-dynamics (EFD) or electrokinetics, is the study of the dynamics of electrically conducting fluid. It is the study of the motions of ionised particles or molecules and their interactions with electric fields and the surrounding fluid.
Electrochemical cell An electrochemical cell is a setup used for creating an electromotive force (voltage) in a conductor separating two reactions. The current is caused by the reactions releasing and accepting electrons in to the different ends of the conductor.
Electrochemical gradient In cellular biology, an electrochemical gradient refers to the electrical and chemical properties across a membrane. These are often due to ion gradients, particularly proton gradients, and can represent a type of potential energy available for work in a cell.
Electrochemical noise Electrochemical Noise (ECN) is the generic term given to fluctuations of current and potential. When associated with corrosion is the result of stochastic pulses of current generated by sudden film rupture, crack propagation, discrete events involving metal dissolution and hydrogen discharge with gas bubble formation and detachment.
Electrochemical potential In electrochemistry, the electrochemical potential is a thermodynamic measure that combines the concepts of energy stored in the form of chemical potential and electrostatics. It is important in biological processes that involve molecular diffusion across membranes, in electroanalytical chemistry, and industrial applications such as batteries and fuel cells.
Electrochemical scanning tunneling microscope The electrochemical scanning tunneling microscope, or ESTM, was invented in 1988 by Kingo Itaya in Japan. With ESTM, the structures of surfaces and electrochemical reactions in solid-liquid interfaces can be observed at atomic or molecular scales.
Electrochemistry Electrochemistry is a branch of chemistry that studies the reactions which take place at the interface of an electronic conductor (the electrode composed of a metal or a semiconductor, including graphite) and an ionic conductor (the electrolyte).
Electrojet An electroject is a electric current which travels around the F region above the equator in the Earth's atmosphere. Kristian Birkeland was the first suggested that polar electric currents (or auroral electrojets) are connected to a system of filaments (now called "Birkeland currents") that flow along geomagnetic field lines into and away from the polar region.
Electrokids Electrokids - promo group that promotes electronic music in Minsk, Belarus. Electrokids are responsible for one of the most influential festivals of electronic music in post-soviet territories, System of Electronic Maddness and most quality dnb events in the country since 2003.
Electrola Electrola was a record label founded in Berlin in 1925 by the Gramophone Company. In March 1931 Electrola, along with its parent label and Lindstrom parent Columbia Graphophone Company, merged to form the Electric & Musical Industries Ltd.
Electrolaser An electrolaser is a type of directed-energy weapon. It uses lasers (sometimes laser diodes) to let blooming occur, or operating at wavelengths which cause atmosphere (or its component oxygen) to temporarily change state into a plasma.
Electroliner The Electroliners were a pair of distinctive electric passenger train sets operated by the Chicago North Shore and Milwaukee Railroad, which ran between Chicago, Illinois, and Milwaukee, Wisconsin. These streamlined electric multiple unit interurban trains were built by St.
Electrology Electrology is either of two electrical epilation methods for the permanent removal of human hair. A practitioner of electrolysis as the term is used in epilation is called an electrologist (or sometimes electrolysist in the United Kingdom).
Electroluminescence Electroluminescence (EL) is an optical phenomenon and electrical phenomenon where a material emits light in response to an electric current passed through it, or to a strong electric field. This is distinct to light emission resulting from heat (incandescence) or from the action of chemicals (chemoluminescence).
Electrolux Global Design Laboratory The Electrolux Global Design Laboratory is an annual competition held by Electrolux, a leading household appliance company. It is designed to support talented design students in their future careers as well as provide Electrolux with smart and "out of the box" insight into future product design possibilities.
Electrolux Laundry Systems Electrolux Laundry Systems, previously named Electrolux Wascator, is a part of the Electrolux Group. Electrolux Laundry Systems is headquartered in Copenhagen, Denmark and is a world leader in supplying professional laundry solutions.
Electrolux Trilobite The Electrolux Trilobite is a domestic robot vacuum cleaner manufactured by the Swedish corporation Electrolux. It has the ability to map rooms rather than cleaning them randomly, and the use of ultrasonic sensors, which detect obstacles and walls at a distance and thereby reduce the number of collisions.
Electrolysis of water Electrolysis of Water is an electrolytic process which decomposes water into oxygen and hydrogen gas with the aid of an electric current, where a power source from a 6 volt battery is commonly used. The electrolysis cell consists of two electrodes (usually an inert metal such as platinum) submerged in an electrolyte and connected to opposite poles of a source of direct current.
Electrolyte An electrolyte is a substance containing free ions that behaves as an electrically conductive medium. Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible.
Electrolyte disturbance In physiology, an electrolyte disturbance is an abnormal change in the levels of electrolytes in the body, usually constituting a medical emergency. Severe or prolonged electrolyte disturbance can lead to cardiac problems, neuronal malfunction, organ failure, and ultimately death, such as with water intoxication.
Electrolytic capacitor An electrolytic capacitor is a type of capacitor typically with a larger capacitance per unit volume than other types, making them valuable in relatively high-current and low-frequency electrical circuits. This is especially the case in power-supply filters, where they store charge needed to moderate output voltage and current fluctuations, in rectifier output, and especially in the absence of rechargeable batteries that can provide similar low-frequency current capacity.
Electrolytic cell Electrolytic cells are composed of a vessel used to do electrolysis, containing electrolyte, usually a solution of water or other solvents capable of dissolving various ions into solution, and a cathode and anode. The electrolyte in the cell is inert unless driven by external voltage into a redox reaction with the anode and cathode.
Electrolytic detector The electrolytic detector or the bare-point electrolytic detector as it was also called, was a type of wet demodulator used in early radio receivers. This form of detector was in extensive use, and was very sensitive and reliable.
Electrolytic process An electrolytic process is the use of electrolysis industrially to refine metals or compounds at a high purity and low cost. Some examples are the Hall-HĂ©roult process used for aluminium, or the production of hydrogen from water.
Electromagnetic Aircraft Launch System Electromagnetic Aircraft Launch System(EMALS) is a system under development by the US Navy to launch aircraft from carriers using magnets instead of steam. It was among the technologies the Chi Mak spyring is accused of compromising to China.
Electromagnetic bomb An electromagnetic bomb or E-bomb is a weapon designed to disable electronics on a wide scale with an electromagnetic pulse. The electromagnetic radiation from an explosion (especially nuclear explosions) or an intensely fluctuating magnetic field is caused by Compton-recoil electrons and photoelectrons from photons scattered in the materials of the electronic or explosive device in a surrounding medium.
Electromagnetic brain animation A method and system providing non-invasive 'cerebral cellular realignment' using electromagnetic brain animation (EBA) as an enhanced initiative for positive influence on brain region neuron activity with the impetus to habilitate, rehabilitate and/or redirect dysfunctional cellular structure. EBA generation is most specifically a non-invasive technique that consists of one or more magnetic fields emanating from one or more wire coils situated and held outside and off of the head within a "Cap" like device.
Electromagnetic brake Electromagnetic brakes, also called eddy current brakes, seek to retard motion or cause deceleration in a moving system. Unlike conventional brakes, which operate by causing friction between moving parts, in an electromagnetic brake kinetic energy is converted to heat without contact between the moving parts.
Electromagnetic cavity An electromagnetic cavity is a cavity that acts as a container for electromagnetic fields such as photons, in effect containing their wave function inside. The size of the cavity determines the maximum photon wave length that can be trapped.
Electromagnetic compatibility Electromagnetic Compatibility (EMC) is the branch of electrical sciences which studies the unintentional generation, propagation and reception of electromagnetic energy with reference to the unwanted effects that such an energy may induce. To this purpose, the goal of EMC is the correct operation, in the same environment, of different equipment which involve electromagnetic phenomena in their operation.
Electromagnetic field The electromagnetic field is a physical field that is produced by electrically charged objects and which affects the behaviour of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and describes electromagnetism, one of the four fundamental forces of nature.

Information are taken from Wikipedia, the open encyclopedia, to which contribute many volunteers from around the whole world. Texts are available under the following conditions GNU Free Documentation License.