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Seebeck effect:
In a closed circuit consisting of two dissimilar metals, when the junctions are maintained at different temperatures an emf is developed. The current that flows due to the emf developed is called thermoelectric current.
Thomson effect:
If two points in a conductor are at different temperatures, the density of electrons at these points will differ and as a result the potential difference is created between these points.
Peltier effect:
When an electric current is passed through a circuit of a thermocouple, heat is evolved at one junction and absorbed at the other junction.
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Sorry, I know Seebeck effect only
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