Repulsion Motor
A repulsion motor is a type of electric motor which runs on alternating current (AC). It was formerly used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors. Repulsion motors are classified as single phase motors. In repulsion motors the stator windings are connected directly to the AC power supply and the rotor is connected to a commutator and brush assembly, similar to that of a direct current (DC) motor.''The Electrical Year Book 1937,'' published by Emmott and Company Limited, Manchester, England, pp 79–82 Construction The motor has a stator and a rotor but there is no electrical connection between the two and the rotor current is generated by induction. The rotor winding is connected to a commutator which is in contact with a short-circuited pair of brushes which can be moved to change their angular position relative to an imaginary line drawn through the axis of the sta ...
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Deri Repulsion Type Motor Midi E 3301
Deri may refer to : People * Aryeh Deri (born 1959), an Israeli politician * Frances Deri (1880–1971), an Austrian psychoanalyst * Miksa Déri (1854–1938), a Hungarian electrical engineer * Shlomo Deri (fl. 2000s), an Israeli politician * Yehuda Deri (fl. 1990s/2000s), an Israeli rabbi Other uses * Deri, Caerphilly, a village in South Wales **Deri RFC, a rugby club * Afon Deri, a river in Mid Wales * Digital Enterprise Research Institute (DERI), Ireland See also * Dari (other) Dari is used as the name for a variety of Persian spoken in Afghanistan, and is also used more broadly as a name for New Persian, describing all contemporary varieties of Persian. Dari may also refer to: People *Achraf Dari (born 1999), a Moroc ...

Electric Arc
An electric arc, or arc discharge, is an electrical breakdown of a gas that produces a prolonged electrical discharge. The electric current, current through a normally Electrical conductance, nonconductive medium such as air produces a plasma (physics), plasma; the plasma may produce visible light. An arc discharge is characterized by a lower voltage than a glow discharge and relies on thermionic emission of electrons from the electrodes supporting the arc. An archaic term is voltaic arc, as used in the phrase "voltaic arc lamp". Techniques for arc suppression can be used to reduce the duration or likelihood of arc formation. In the late 19th century, Arc lamp, electric arc lighting was in wide use for Street light#Arc lamps, public lighting. Some low-pressure electric arcs are used in many applications. For example, fluorescent lamp, fluorescent tubes, mercury, sodium, and metal-halide lamps are used for lighting; xenon arc lamps have been used for movie projectors. Electric a ...
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Deri 1
Deri may refer to : People * Aryeh Deri (born 1959), an Israeli politician * Frances Deri (1880–1971), an Austrian psychoanalyst * Miksa Déri (1854–1938), a Hungarian electrical engineer * Shlomo Deri (fl. 2000s), an Israeli politician * Yehuda Deri (fl. 1990s/2000s), an Israeli rabbi Other uses * Deri, Caerphilly, a village in South Wales **Deri RFC, a rugby club * Afon Deri, a river in Mid Wales * Digital Enterprise Research Institute (DERI), Ireland See also * Dari (other) Dari is used as the name for a variety of Persian spoken in Afghanistan, and is also used more broadly as a name for New Persian, describing all contemporary varieties of Persian. Dari may also refer to: People *Achraf Dari (born 1999), a Moroc ...

Elihu Thomson
Elihu Thomson (March 29, 1853 – March 13, 1937) was an English-born American engineer and inventor who was instrumental in the founding of major electrical companies in the United States, the United Kingdom and France. Early life He was born in Manchester, England, on March 29, 1853, but his family moved to Philadelphia in the United States in 1858. and   Thomson attended Central High School in Philadelphia and graduated in 1870. Thomson took a teaching position at Central, and in 1876, at the age of twenty-three, held the chair of Chemistry. In 1880, he left Central to pursue research in the emerging field of electrical engineering. Electrical innovations With Edwin J. Houston, a former teacher and later colleague of Thomson's at Central High School, Thomson founded the Thomson-Houston Electric Company. Notable inventions created by Thomson during this period include an arc-lighting system, an automatically regulated three-coil dynamo, a magnetic lightning arrest ...
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Torque
In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of the body. The concept originated with the studies by Archimedes of the usage of levers, which is reflected in his famous quote: "''Give me a lever and a place to stand and I will move the Earth''". Just as a linear force is a push or a pull, a torque can be thought of as a twist to an object around a specific axis. Torque is defined as the product of the magnitude of the perpendicular component of the force and the distance of the line of action of a force from the point around which it is being determined. The law of conservation of energy can also be used to understand torque. The symbol for torque is typically \boldsymbol\tau, the lowercase Greek letter '' tau''. When being referred to as moment of force, it is commonly denoted by . ...
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Lenz's Law
Lenz's law states that the direction of the electric current induced in a conductor by a changing magnetic field is such that the magnetic field created by the induced current opposes changes in the initial magnetic field. It is named after physicist Emil Lenz, who formulated it in 1834. It is a qualitative law that specifies the direction of induced current, but states nothing about its magnitude. Lenz's law predicts the direction of many effects in electromagnetism, such as the direction of voltage induced in an inductor or wire loop by a changing current, or the drag force of eddy currents exerted on moving objects in a magnetic field. Lenz's law may be seen as analogous to Newton's third law in classical mechanicsSchmitt, Ron ''Electromagnetics explained'' 2002. Retrieved 16 July 2010. and Le Chatelier's principle in chemistry. Definition Lenz's law states that: The current induced in a circuit due to a change in a magnetic field is directed to oppose the change in flu ...
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South Pole
The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is one of the two points where Earth's axis of rotation intersects its surface. It is the southernmost point on Earth and lies antipodally on the opposite side of Earth from the North Pole, at a distance of 12,430 miles (20,004 km) in all directions. Situated on the continent of Antarctica, it is the site of the United States Amundsen–Scott South Pole Station, which was established in 1956 and has been permanently staffed since that year. The Geographic South Pole is distinct from the South Magnetic Pole, the position of which is defined based on Earth's magnetic field. The South Pole is at the centre of the Southern Hemisphere. Geography For most purposes, the Geographic South Pole is defined as the southern point of the two points where Earth's axis of rotation intersects its surface (the other being the Geographic North Pole). However, Earth's axis of rota ...
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North Pole
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's rotation, Earth's axis of rotation meets its surface. It is called the True North Pole to distinguish from the Magnetic North Pole. The North Pole is by definition the northernmost point on the Earth, lying antipode (geography), antipodally to the South Pole. It defines geodetic latitude 90° North, as well as the direction of true north. At the North Pole all directions point south; all lines of longitude converge there, so its longitude can be defined as any degree value. No time zone has been assigned to the North Pole, so any time can be used as the local time. Along tight latitude circles, counterclockwise is east and clockwise is west. The North Pole is at the center of the Northern Hemisphere. The nearest land is usually said to be Kaffeklubben Island, off the northern coast of Greenland about away, though some perhaps semi-per ...
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Electromotive Force
In electromagnetism and electronics, electromotive force (also electromotance, abbreviated emf, denoted \mathcal or ) is an energy transfer to an electric circuit per unit of electric charge, measured in volts. Devices called electrical '' transducers'' provide an emf by converting other forms of energy into electrical energy. Other electrical equipment also produce an emf, such as batteries, which convert chemical energy, and generators, which convert mechanical energy. This energy conversion is achieved by physical forces applying physical work on electric charges. However, electromotive force itself is not a physical force, and for the current ISO/ IEC standards consider the term deprecated, favoring the names source voltage or source tension instead (denoted U_s). An electronic–hydraulic analogy may view emf as the mechanical work done to water by a pump, which results in a pressure difference (analogous to voltage). In electromagnetic induction, emf can be ...
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Salient Pole
A field coil is an electromagnet used to generate a magnetic field in an electro-magnetic machine, typically a rotating electrical machine such as a motor or generator. It consists of a coil of wire through which a current flows. In a rotating machine, the field coils are wound on an iron magnetic core which guides the magnetic field lines. The magnetic core is in two parts; a stator which is stationary, and a rotor, which rotates within it. The magnetic field lines pass in a continuous loop or magnetic circuit from the stator through the rotor and back through the stator again. The field coils may be on the stator or on the rotor. The magnetic path is characterized by ''poles'', locations at equal angles around the rotor at which the magnetic field lines pass from stator to rotor or vice versa. The stator (and rotor) are classified by the number of poles they have. Most arrangements use one field coil per pole. Some older or simpler arrangements use a single field coil w ...
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Magnetic Field
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets. In addition, a nonuniform magnetic field exerts minuscule forces on "nonmagnetic" materials by three other magnetic effects: paramagnetism, diamagnetism, and antiferromagnetism, although these forces are usually so small they can only be detected by laboratory equipment. Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time. Since both strength and direction of a magnetic field may vary with location, it is described mathematically by a function assigning a vector to each point of sp ...
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Repulsion Als Symbol Linkslauf
Repulsion may refer to: * Disgust, or repulsion, an emotional response to something considered offensive or unpleasant * Repulsion, a type of genetic linkage * Repulsion in physics, Coulomb's law ** Repulsion in diamagnetism, which pushes two bodies away from each other * Repulsion theory, in botany In the arts: * Repulsion (band), a grindcore band * ''Repulsion'' (film), a 1965 horror film directed by Roman Polański * "Repulsion", a 1985 song by Dinosaur Jr See also * Repulse (other) * Repulsive force (other) Repulsive force may refer to: * A repulsive force of an accelerating universe, which according to certain theories causes planets and matter to get farther and farther apart * Like charges repelling according to Coulomb's law * Repulsive force (mag ...