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1 Thévénin, Léon Charles
SUBJECT AREA: Electricity[br]b. 30 March 1857 Paris, Franced. 21 September 1926 Paris, France[br]French telegraph engineer who extended Ohm's Law to the analysis of complex electrical circuits.[br]Following a basic education, Thévénin entered the Ecole Polytechnique in Paris, graduating in 1876. In 1878 he joined the Corps of Telegraph Engineers (which subsequently became the French PTT). There he initially worked on the development of long-distance underground telegraph lines, but he later switched to working on power lines. Appointed a teaching inspector at the Ecole Supérieure in 1882, he became increasingly interested in the problems of measurement in electrical circuits. As a result of studying Kirchoff's Laws, which were essentially derived from Ohm's Law, he developed his now-famous theorem which made it possible to calculate the currents in more complex electrical circuits.As well as becoming Head of the Bureau des Lignes, up until his death he also found time for teaching other subjects outside the Ecole, including a course in mechanics at the Institut National Agronomique. In 1896 he was appointed Director of the Telegraph Engineering School, then, in 1901, Engineer-in-Chief of the telegraph workshops. He retired in 1914.[br]Bibliography1883, "Extension of Ohm's Law to complex electrical circuits", Comptes rendus 97:159 (describes Thévénin's Theorem).Further ReadingF.E.Terman, 1943, Radio Engineers'Handbook, New York: McGraw-Hill, Section 3 (summarizes the relevant circuit theory).KF -
2 Electricity
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3 Ohm, Georg Simon
SUBJECT AREA: Electricity[br]b. 16 March 1789 Erlangen, near Nuremberg, Germanyd. 6 July 1854 Munich, Germany[br]German physicist who laid the foundations of electrical science with his discovery of Ohm's Law.[br]Given the same first name as his father, Johann, at his baptism, Ohm was generally known by the name of Georg to avoid confusion. While still a child he became interested in science and learned many of his basic skills from his father, a mechanical engineer. After basic education he attended the Gymnasium at Erlangen for a year, then in 1805 he entered the University of Erlangen. Probably for financial reasons, he left after three terms in 1806 and obtained a post as a mathematics tutor at a school in Gottstadt, Switzerland, where he may well have begun to experiment with electrical circuits. In 1811 he returned to Erlangen. He appears to have obtained his doctorate in the same year. After studying physics for a year, he became a tutor at the Studienanstalt (girls' secondary school) at Bamberg in Bavaria. There, in 1817, he wrote a book on the teaching of geometry in schools, as a result of which King Freidrich Wilhelm III of Prussia had him appointed Oberlehrer (Senior Master) in Mathematics and Physics at the Royal Consistory in Cologne. He continued his electrical experiments and in 1826 was given a year's leave of absence to concentrate on this work, which culminated the following year in publication of his "Die galvanische Kette", in which he demonstrated his now-famous Law, that the current in a resistor is proportional to the applied voltage and inversely proportional to the resistance. Because he published only a theoretical treatment of his Law, without including the supporting experimental evidence, his conclusions were widely ignored and ridiculed by the eminent German scientists of his day; bitterly disappointed, he was forced to resign his post at the Consistory. Reduced to comparative poverty he took a position as a mathematics teacher at the Berlin Military School. Fortunately, news of his discovery became more widely known, and in 1833 he was appointed Professor at the Nuremberg Polytechnic School. Two years later he was given the Chair of Higher Mathematics at the University of Erlangen and the position of State Inspector of Scientific Education. Honoured by the Royal Society of London in 1841 and 1842, in 1849 he became Professor of Physics at Munich University, apost he held until his death.[br]Principal Honours and DistinctionsRoyal Society Copley Medal 1841. FRS 1842.Bibliography1817, "Grundlinien zu einer zweckmàssigen Behandlung der Geometric als hohern Bildungsmittels an vorbereitenden Lehranstalt".1827, "Die galvanische Kette, mathematische bearbeit".Further ReadingF.E.Terman, 1943, Radio Engineers' Handbook, New York: McGraw-Hill, Section 3 (for circuit theory based on Ohm's Law).See also: Thévénin, Léon CharlesKF
См. также в других словарях:
Leon Charles Thevenin — Léon Charles Thévenin Pour les articles homonymes, voir Thévenin. Léon Charles Thévenin Léon Charles Thévenin (30 … Wikipédia en Français
Léon charles thevenin — Léon Charles Thévenin Pour les articles homonymes, voir Thévenin. Léon Charles Thévenin Léon Charles Thévenin (30 … Wikipédia en Français
Léon Charles Thévenin — (* 30. März 1857 in Meaux, Frankreich; † 21. September 1926 in Paris, Frankreich) war ein französischer Telegrafeningenieur. Er ist der Namensgeber des Thévenin Theorems. Thévenin diplomierte 1876 an der École polytechnique (dt … Deutsch Wikipedia
Léon Charles Thévenin — Léon Charles Thévenin. Léon Charles Thévenin (Meaux, 30 de marzo de 1857 21 de septiembre de 1926), fue un ingeniero en telegrafía francés, que extendió el análisis de la Ley de Ohm a los circuitos eléctricos complejos. Su aporte más importante… … Wikipedia Español
Léon Charles Thévenin — Pour les articles homonymes, voir Thévenin. Léon Charles Thévenin Léon Charles Thévenin Naissance 30 mars 1857 … Wikipédia en Français
Léon Charles Thévenin — (March 30, 1857 September 21, 1926) was a French telegraph engineer who extended Ohm s law to the analysis of complex electrical circuits. Background Born in Meaux, Thévenin graduated from the École Polytechnique in Paris in 1876. In 1878, he… … Wikipedia
Thevenin — Léon Charles Thévenin Pour les articles homonymes, voir Thévenin. Léon Charles Thévenin Léon Charles Thévenin (30 … Wikipédia en Français
Thevenin — Thévenin ist der Name von Charles Thévenin (1764−1838), französischer Maler des Neoklassizismus Léon Charles Thévenin : französischer Telegrafeningenieur (* 1857; † 1926); Namensgeber des Thévenin Theorems. Siehe auch: Thévenin Theorem : Ein Satz … Deutsch Wikipedia
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Thévenin-Äquivalent — In der Theorie linearer elektrischer Netzwerke besagt das Thévenin Theorem (auch Helmholtz Thévenin Theorem), dass jede mögliche Kombination von Spannungsquellen, Stromquellen und Widerständen bezüglich zweier Klemmen elektrisch äquivalent zu… … Deutsch Wikipedia
