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41 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 -
42 حل
حَلَّ \ loose: to unfasten: He loosened the string round the bundle. solve: to find the answer to sth. (a difficult question, a problem, etc.); find the cause of sth. (a crime): Some murders are never solved. undo: to loosen (a knot, button, etc.) unfasten (a garment). unravel: to straighten (string, woollen threads etc.) that is mixed up; make clear (a story, a mystery, etc.) which is confused. work out: to calculate; to produce (a plan, etc.) by careful thought: He worked out the probable cost of the building. \ حَلَّ \ dissolve: make (sth. solid) become liquid: Dissolve the salt in the water. \ See Also أذاب (أَذابَ) \ حَلَّ قَبْضَتَهُ عن \ let go, leave go: not to hold any longer: Hold this rope tight and don’t let go (or let it go or let go of it). Don’t let go the rope till I tell you. \ حَلَّ لُغْزًا \ puzzle sth. out: to think hard until one understands: This is a difficult question but I shall puzzle it out. \ حَلَّ مَحَلّ \ relieve: to take sth. from sb.: A new guard relieved the old one (took his place so that he could go and rest). replace: to take the place of: Oil has replaced coal in most ship’s engines. supersede: to take the place of: Electricity has superseded oil as a means of lighting in most countries. supplant: to take the place of sb. (often unfairly): During my absence abroad, I’ve been supplanted by Tom as Rose’s boy-friend.
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