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Georg Simon Ohm (/ oʊ m /; [1] German: [ˈɡeːɔʁk ˈʔoːm]; [2] [3] 16 March 1789 – 6 July 1854) was a German physicist and mathematician. As a school teacher, Ohm began his research with the new electrochemical cell , invented by Italian scientist Alessandro Volta .
Ohm's law, in physics: the ratio of the potential difference (or voltage drop) between the ends of a conductor (and resistor) to the current flowing through it is a constant. Discovered by and named after Georg Simon Ohm (1789–1854). Ohm's acoustic law is an empirical approximation concerning the perception of musical tones, named for Georg ...
1826 – Georg Simon Ohm states his Ohm's law of electrical resistance in the journals of Schweigger and Poggendorff, and also published in his landmark pamphlet Die galvanische Kette mathematisch bearbeitet in 1827. The unit ohm (Ω) of electrical resistance has been named in his honor. [18]
Georg Simon Ohm. Futile attempts were made by Charles Babbage, Peter Barlow, John Herschel and others to explain this phenomenon. The true explanation was reserved for Faraday, namely, that electric currents are induced in the copper disc by the cutting of the magnetic lines of force of the needle, which currents in turn react on the needle.
1922: J. McWilliams Stone invents the first portable radio receiver. George Frost builds the first "car radio" in his Ford Model T. 1923 The 15-year-old Manfred von Ardenne is granted his first patent for an electron tube having a plurality of electrodes. Siegmund Loewe (1885–1962) builds with the tube his first radio receiver "Loewe Opta-".
Ohm explained his experimental results by a slightly more complex equation than the modern form above (see § History below). In physics, the term Ohm's law is also used to refer to various generalizations of the law; for example the vector form of the law used in electromagnetics and material science:
1827: Georg Ohm: Ohm's law (Electricity). 1827: Amedeo Avogadro: Avogadro's law . 1828: Friedrich Wöhler synthesized urea, refuting vitalism. 1830: Nikolai Lobachevsky created Non-Euclidean geometry. 1831: Michael Faraday discovers electromagnetic induction. 1833: Anselme Payen isolates first enzyme, diastase.
May 1 – Georg Ohm publishes Die galvanische Kette, mathematisch bearbeitet (tr., The Galvanic Circuit Investigated Mathematically) in which Ohm's law makes its first appearance. Scottish botanist Robert Brown observes the phenomenon of Brownian motion. [13] Joseph Fourier first proposes existence of the greenhouse effect. [14]