Thermoelectricity refers to a phenomenon that occur at the junctions of dissimilar conductors or within a single conductor, when a temperature difference exists between the junctions or across a conductor. There are three thermogalvanic effects, namely Seebeck effect, Peltier effect and Thomson effect. They involve conversion of thermal energy into electrical energy or vica versa. They are all reversible in contrast with the Joule effect which is irrevesible. Seebeck effect is the superposition of Peltier effect and Thomson effect. In a thermocouple, if the two junctions are maintained at a potential difference, a temperature difference is established, i.e. heat is generated at one junction and absorbed at the other junction. This is called Peltier effect and its converse is the Seebeck effect. The relationship between the. thermo-emf across the junction and the temperature difference is parabolic.
Which thermogalvnic effect takes place in a single conductor

Options

A. Seebeck effect
B. Peltier effect
C. Joule effect
D. Thomson effect

Answer

D