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State Seeback effect and Peltier effect. Write material used in different thermocouples.

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Seeback effect:- Seeback effect states that whenever two dissimilar metals are connected together to form two junctions out of which, one junction is subjected to high temperature and another is subjected to low temperature then e.m.f is induced proportional to the temperature difference between two junctions.

Peltier effect:- Peltier effect states that for two dissimilar metals closed loop, if current forced to flow through the closed loop then one junction will be heated and other will become cool.

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Seebeck effect: is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances. If the two conductors or semiconductors are connected together through an electrical circuit, direct current (DC) flows through that circuit.

Peltier effect: The Peltier effect is a temperature difference created by applying a voltage between two electrodes connected to a sample of semiconductor material. This phenomenon can be useful when it is necessary to transfer heat from one medium to another on a small scale.

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