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Hermann Aron
Hermann Aron (; 1 October 1845 – 29 August 1913) was a German researcher of electrical engineering. Background Aron was born in KÄ™pno, Kempen (KÄ™pno), in modern-day Poland, at the time a shtetl in the Province of Posen. His father was a chazzan and merchant. The family wanted him to train as a Jewish scholar or scrivener, however wealthy relatives made it possible for him to attend from 1862 the :de:Realgymnasium, high school at Kölln, Berlin and after graduating in 1867, to study at the University of Berlin. Aron began by studying medicine, but changed in the 3rd term to mathematics and natural sciences. From 1870 he studied at the University of Heidelberg, with such notable physics lecturers as Hermann von Helmholtz, Helmholtz and Gustav Kirchhoff, Kirchhoff. He obtained his doctorate from Berlin in 1873 and became an assistant at the physical laboratory of the trade academy (Gewerbeakademie). He taught at the University of Berlin where he became professor of physics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weißensee Cemetery
Weißensee (German: ''white lake'') may refer to: Places * Weissensee (Berlin), a district of Berlin *Weißensee, Thuringia, a town in Thuringia, Germany * Weissensee, Austria, a municipality in Carinthia, Austria * Weissensee (Carinthia), a lake in Carinthia, Austria * Weißensee (Füssen), a lake in Allgäu, Bavaria, Germany People * Friedrich Weissensee (c.1560–1622), German composer and Protestant minister Other *Weissensee, a song by Neu! Neu! (; German for "New!"; styled in block capitals) were a West German krautrock band formed in Düsseldorf in 1971 by Klaus Dinger and Michael Rother following their departure from Kraftwerk. The group's albums were produced by Conny Plank, w ... from their eponymous first album *Weissensee, a song by Elder_(band) from their 2019 album The Gold & Silver Sessions * Weissensee (TV series), a German television series See also * White Lake (other) {{geodis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Åšwidnica
Świdnica (; ; ) is a city on the Bystrzyca (Oder), Bystrzyca River in south-western Poland in the Lower Silesian Voivodeship. As of 2021, it has a population of 55,413 inhabitants. It is the seat of Świdnica County, and also of the smaller district of Gmina Świdnica, Lower Silesian Voivodeship, Gmina Świdnica (although it is not part of the territory of the latter, as the town forms a separate urban gmina). It is the seventh largest city of the Lower Silesian Voivodeship. Świdnica became part of the Wałbrzych urban agglomeration, agglomeration on 23 January 2014. A city with almost a thousand years of history, recorded in 1070, Świdnica was one of the main cities of Silesia and southwestern Poland in the Middle Ages, the second most important center of culture and art in the region (after Wrocław), a famed brewing center, and in 1291–1392 the capital of an eponymous principality ruled by a local line of the Piast dynasty. The city has a preserved Old Town with several G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alternating Current
Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, Fan (machine), fans and electric lamps into a wall socket. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', respectively, as when they modify ''Electric current, current'' or ''voltage''. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a ''wave cycle, cycle''). "Alternating current" most commonly refers to power distribution, but a wide range of other appl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-phase
Three-phase electric power (abbreviated 3Ï•) is a common type of alternating current (AC) used in electricity generation, Electric power transmission, transmission, and Electric power distribution, distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power. Three-phase electrical power was developed in the 1880s by several people. In three-phase power, the voltage on each wire is 120 degrees phase shifted relative to each of the other wires. Because it is an AC system, it allows the voltages to be easily stepped up using transformers to high voltage for transmission and back down for distribution, giving high efficiency. A three-wire three-phase circuit is usually more economical than an equivalent two-wire Single-phase electric power, single-phase circuit at the same line-to-ground voltage because it uses less conductor material to tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eponymous
An eponym is a noun after which or for which someone or something is, or is believed to be, named. Adjectives derived from the word ''eponym'' include ''eponymous'' and ''eponymic''. Eponyms are commonly used for time periods, places, innovations, biological nomenclature, astronomical objects, works of art and media, and tribal names. Various orthographic conventions are used for eponyms. Usage of the word The term ''eponym'' functions in multiple related ways, all based on an explicit relationship between two named things. ''Eponym'' may refer to a person or, less commonly, a place or thing for which someone or something is, or is believed to be, named. ''Eponym'' may also refer to someone or something named after, or believed to be named after, a person or, less commonly, a place or thing. A person, place, or thing named after a particular person share an eponymous relationship. In this way, Elizabeth I of England is the eponym of the Elizabethan era, but the Elizabethan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wattmeter
The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements. A wattmeter reads the average value of the product ''v(t)i(t) = p(t)'', where ''v(t)'' is the voltage with positive reference polarity at the ± terminal with respect to the other terminal of the potential coil, and ''i(t)'' is the current with reference direction flowing into the ± terminal of the current coil. The wattmeter reads ''P = (1/T) ∫0T v(t)i(t) dt'', which in sinusoidal steady-state reduces to ''V''rms ''I''rms cos(φ), where ''T'' is the period of ''p(t)'' and φ is the angle by which the current lags the voltage. History The Hungarian Ottó Bláthy patented his AC wattmeter. In 1974 Maghar S. Chana, Ramond L. Kraley, Eric A. Hauptmann Barry, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Electric Company Plc
The General Electric Company (GEC) was a major British industrial conglomerate involved in consumer and defence electronics, communications, and engineering. It was originally founded in 1886 as G. Binswanger and Company as an electrical goods wholesaler based in London. It quickly adopted a then-unorthodox business model of supplying electrical components over the counter. In 1889, the business was incorporated as the General Electric Company Ltd, and became a public limited company 11 years later. During the 1890s and 1900s, the company heavily invested into electric lighting, a sector that proved to be immensely profitable in the long term. The GEC was heavily impacted by the outbreak of the First World War, supplying various goods to the military, and thus becoming a major player in the electrical industry. In 1921, a new purpose-built company headquarters (Magnet House) was opened in Kingsway, London; two years later, GEC's industrial research laboratories at Wembley (late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hugo Hirst
Hugo Hirst, 1st Baron Hirst (26 November 1863 – 22 January 1943), known as Sir Hugo Hirst, Bt, between 1925 and 1934, was a German-born British industrialist. Born near Munich, Hugo Hirsch became a naturalized British subject in 1883 and changed his surname to Hirst. He was co-founder with Gustav Binswanger of the General Electric Company plc, and in 1910 became its chairman. He was created a baronet A baronet ( or ; abbreviated Bart or Bt) or the female equivalent, a baronetess (, , or ; abbreviation Btss), is the holder of a baronetcy, a hereditary title awarded by the British Crown. The title of baronet is mentioned as early as the 14th ..., of Witton in the County of Warwick, on 2 July 1925 and elevated to the peerage as Baron Hirst, of Witton in the County of Warwick, on 28 June 1934. Hirst's eldest daughter Muriel married Leslie Gamage, the elder son of Arthur Walter Gamage, the founder of Gamages department store. Leslie joined GEC and became chairman and manag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-winding Clock
An automatic watch, also known as a self-winding watch or simply an automatic, is a mechanical watch where the natural motion of the wearer provides energy to wind the mainspring, making manual winding unnecessary if worn enough. It is distinguished from a ''manual watch'' in that a manual watch must have its mainspring wound by hand at regular intervals. Operation In a mechanical watch the watch's gears are turned by a spiral spring called a mainspring. In a ''manual watch'', energy is stored in the mainspring by turning a knob, the ''crown'', on the side of the watch. Then the energy from the mainspring powers the watch movement until it runs down, requiring the spring to be wound again. A self-winding watch movement has a mechanism which winds the mainspring using the natural motions of the wearer's body. The watch contains an oscillating weight that turns on a pivot. The normal movements of the watch in the user's pocket (for a pocketwatch) or on the user's arm (for a wris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Differential (mechanical Device)
A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analogue computers. Differentials can also provide a gear ratio between the input and output shafts (called the "axle ratio" or "diff ratio"). For example, many differentials in motor vehicles provide a gearing reduction by having fewer teeth on the pinion than the ring gear. History Milestones in the design or use of differentials include: * 100 BCE–70 BCE: The Antikythera mechanism has been dated to this period. It was discovered in 1902 on a shipwreck by sponge divers, and modern research suggests that it used a differential gear to determine the angle between the ecliptic positions of the Sun and Moon, and thus the phase of the Moon. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
