- Thomas Johann Seebeck
name = Thomas Johann Seebeck
April 9 1770
December 10 1831
death_place = Berlin [cite book | title = A Scientific German Reader | author = George Theodore Dippold | publisher = Ginn & Co. | year = 1904 | url = http://books.google.com/books?id=_2kBAAAAYAAJ&pg=PA216&dq=%22Thomas+Johann+Seebeck%22&lr=&as_brr=1&ei=WMbuR-D9GY2GtgODuNHyCA#PPA212,M1 ]
known_for = Discovered the
Thomas Johann Seebeck (
April 9 1770– December 10 1831) was a physicist who in 1821 discovered the thermoelectric effect.
Seebeck was born in
Reval(today Tallinn, Estonia) to a wealthy Baltic German merchant family. He received a medical degree in 1802 from the University of Göttingen, but preferred to study physics. In 1821 he discovered the thermoelectric effect, where a junction of dissimilar metals produces an electric current when exposed to a temperature gradient. This is now called the Peltier–Seebeck effectand is the basis of thermocouples and thermopiles.
In 1821 Thomas Johann Seebeck found that a circuit made from two dissimilar
metals, with junctions at different temperatures would deflect a compass magnet. Seebeck initially believed this was due to magnetisminduced by the temperature difference. However, it was quickly realized that it was an electrical current that is induced, which by Ampere's lawdeflects the magnet. More specifically, the temperature difference, produces an electric potential ( voltage) which can drive an electric current in a closed circuit. Today, this effect is known as the Peltier–Seebeck effect.
The voltage produced is proportional to the temperature difference between the two junctions. The proportionality constant (a) is known as the
Seebeck coefficient, and often referred to as the thermoelectric poweror thermopower. The Seebeck voltage does not depend on the distribution of temperature along the metals between the junctions. This effect is the physical basis for a thermocouple, which is used often for temperature measurement.
The voltage difference, "V", produced across the terminals of an open circuit made from a pair of dissimilar metals, A and B, whose two junctions are held at different temperatures, is directly proportional to the difference between the hot and cold junction temperatures, "T"h - "T"c.
Precursors to photography
In 1810, at
Jena, Seebeck described the action of the spectrum of light on the chloride of silver. He observed that the exposed chemical would sometimes take on a pale version of the color of light that exposed it, and also reported the action of light for a considerable distance beyond the violet end of the spectrum. [cite book | title = The Encyclopædia Britannica: A Dictionary of Arts, Sciences, Literature and General Information | author = Hugh Chisholm, editor | year = 1911 | edition = Eleventh ed. | volume = XXI | pages = p.485 | url = http://books.google.com/books?id=hGgEAAAAYAAJ&pg=PA485&dq=%22Thomas+Johann+Seebeck%22&lr=&as_brr=1&ei=WMbuR-D9GY2GtgODuNHyCA ]
* [http://chem.ch.huji.ac.il/~eugeniik/history/seebeck.html A Biography of Seebeck, includes references]
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Thomas Johann Seebeck — Thomas Seebeck Thomas Johann Seebeck (* 29. Märzjul./ 9. April 1770greg. in Reval (heute Tallinn); † 10. Dezember 1831 in Berlin) war ein deutsch baltischer Physiker … Deutsch Wikipedia
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Thomas Johann Seebeck — Artículo principal: Efecto Peltier Seebeck Thomas Johann Seebeck. Thomas Johann Seebeck (Reval, 9 de abril de 1770 – Berlín, 10 de diciembre de 1831). Médico e investigador físico natural de Estonia, de origen … Wikipedia Español
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Seebeck , Thomas Johann — (1770–1831) Estonian–German physicist Seebeck was born into a wealthy family in Tallinn, the Estonian capital, and moved to Germany at the age of 17. He studied medicine in Berlin and in 1802 received an MD from the University of Göttingen. More… … Scientists
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