Seebeck Thomas

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)... 

In 1821, Thomas Seebeck, an Estonian physician, discovered the existence of an electric current in a closed circuit consisting of unlike conductors, when the junctions between the conductors were at different temperatures. This discovei y is the basis for ther-... 

Wilhelm Weber, Franz Neumann, and Thomas Seebeck filled its pages and following the founding of the "new" physical chemistry in the 1880s, the Annalen dropped "Chemie" from its title in 1900. 

It is believed that Galileo invented the liquid-in-glass thermometer around 1592. Thomas Seebeck discovered the principle behind the TC—the existence of the thermoelectric current—in 1821. The same year Sir Humphry Davy noted the temperature dependence of metals, but C. H. Meyers did not build the RTD until 1932. Today, some 20 different types of temperature sensors are available, and Table 3.160 lists the temperature ranges and accuracies of a number of them. 

In 1821 Thomas Seebeck discovered that when two different types of metal wires were joined at both ends and one of the ends was heated or cooled, a current was created within the closed loop (this current is now called the Seebeck effect). Specifically, heat energy was transformed into measurable electrical energy. 

Thomas John Seebeck, a German physicist, discovered that if two dissimilar metals were placed together and heated at one end, a potential was generated - thermal electricity. 

The most common and convenient means of measuring temperature is to use a thermocouple. The principle behind the operation of a thermocouple is the Seebeck effect discovered in 1821 by Thomas Seebeck. If two wires of different metallic composition are connected at their ends forming a closed circuit, an electric current flows if one of the connections is heated. Measuring the potential (emf) causing this current allows the determination of temperature. In Seebeck s original research the two metals were bismuth and copper. 

Thermocouple (Fig. 2) is one of the most widely used sensors for temperamre measurement and control. The mechanism underlying the function of thermocouples is the so-called thermoelectric effect or Seebeck effect, named after the German-Estonian physicist Thomas J. Seebeck in 1821. 

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

The generation of an e.m.f. in a circuit containing two different metals or semiconductors, when the junctions between the two are maintained at different temperatures. The magnitude of the e.m.f. depends on the nature of the metals and the difference in temperature. The Seebeck effect is the basis of the thermocouple. It was named after Thomas Seebeck (1770-1831), who actually found that a magnetic field surrounded a circuit consisting of two metal conductors only if the junctions between the metals were maintained at different temperatures. He wrongly assumed that the conductors were magnetized directly by the temperature difference. Compare Peitier effect. 

The fact that a heat flow is accompanied by a small electric current was discovered 1821 by Thomas Seebeck. The generated electric field is proportional to the temperature gradient whereby the proportionality... 

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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