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Powerspot. The Seebeck Effect
In 1821 Thomas Johann Seebeck discovered the
thermoelectric effect:
 Seebeck, in 1821, discovered that a compass needle
would be deflected by a closed loop formed by two
different metals joined in two places, with a temperature
difference between the junctions.
 This was because the metals responded to the
temperature difference in different ways, creating a
current loop and a magnetic field.
The Seebeck effect is the conversion of temperature
differences directly into electricity.
Seebeck did not recognize there was an
electric current involved, so he called the
phenomenon the thermomagnetic effect.
Danish physicist Hans Christian Ørsted
rectified the mistake and coined the term
"thermoelectricity".