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In 1821 Thomas Seebeck discovered that the junction between two metals generates a voltage that is a function of temperature. If a closed circuit consists of conductors of two different metals, and if one junction of the two metals is at a higher temperature than the other, an electromotive force is created in a specific polarity. An example of ...
The wavelength of the light emitted, and thus its color, depends on the band gap energy of the materials forming the p-n junction. In silicon or germanium diodes, the electrons and holes usually recombine by a non-radiative transition, which produces no optical emission, because these are indirect band gap materials.
A thermocouple, also known as a "thermoelectrical thermometer", is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction.A thermocouple produces a temperature-dependent voltage as a result of the Seebeck effect, and this voltage can be interpreted to measure temperature.
Thermopile, composed of multiple thermocouples in series. If both the right and left junctions are the same temperature, voltages cancel out to zero. However, if there is a temperature difference between sides the resulting total output voltage is equal to the sum of junction voltage differentials.
Multi-junction (MJ) solar cells are solar cells with multiple p–n junctions made of different semiconductor materials. Each material's p–n junction will produce electric current in response to different wavelengths of light .
The greenhouses of Fridheimar, an hour east of Iceland’s capital Reykjavik, produce 370 tons of tomatoes each year. JJ Gouin/istockphoto. Corn in Africa.
Junction temperature may be measured indirectly using the device's inherent voltage/temperature dependency characteristic. Combined with a Joint Electron Device Engineering Council (JEDEC) technique such as JESD 51-1 and JESD 51-51, this method will produce accurate measurements.
Here’s a time-saving tip: Check the produce section for convenient vacuum-sealed pouches of cooked, peeled beets that are ready to eat! dianazh - Getty Images. Brussels Sprouts.