Seebeck, Thomas Johann

Seebeck, Thomas Johann (1770-1831) Barbara Flume-Gorezyea... 

Seebeck, Thomas Johann (1770-1831) was born in Estonia. He showed that a current flowed when you join two metals that are at different temperatures (the thermoelectric effect) this led to the invention of the thermocouple. 

Seebeck Thomas Johann (1770-1831) Brit, phys., devised thermocouple, built a polariscope, studied heat radiation, thermomagnetic effect (known as Seebeck s effect)... 

Thomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Tallinn, Estonia Paul Annus... 

Thomas Johann Seebeck (1770-1831) German-Estonian physicist Revel, Prussia presently Tallinn, Estonia, t Jean-Charles Athanase Peltier (1785-1845) Erench watchmaker and physicist Paris, France. 

In 1821, Estonian physicist Thomas Johann Seebeclc observed that when two wires of dissimilar conductors A and B (i.e., metals, alloys, or semiconductors) are joined together at both ends and the two junctions are kept at two different temperatures, i.e., cold junction temperature and hot junction temperature T, (Figure 9.1), the temperature differential AT = (T, - TJ produces an electric current that flows continuously through the circuit. This phenomenon was called the Seebeck effect after its discoverer. 

Probe Thermometers. Volume expansion thermometers use the expansion of liquids with rising temperature through a narrow tube. The expansion coefficient, defined as the increase in volume per unit volume per unit rise in temperature, is 0.00018 per Kelvin for mercury and 0.00109 per Kelvin for ethyl alcohol colored with dye. Calculating temperature from the actual random thermal motion velocity of every molecule, or the energy contained in a vibrational excitation of every molecule, is impractical. So temperature is measured indirectly in most applications. Different metals expand to different extents when their temperature rises. This difference is used to measure the bending of two strips of metal attached to one another in outdoor thermometers. Thermocouples use the Seebeck or thermoelectric effect discovered by Cerman physicist Thomas Johann Seebeck, in which a voltage difference is produced between two junctions between wires of... 

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