The thermoelectric effect is the direct conversion of heat into electricity. According to Joules Law, a current-carrying conductor produces heat proportional to the product of the resistance of the conductor and the square of the current passing through it. In the 1820s, Thomas J. Seebeck tested this law by interpreting it differently. He brought two dissimilar metals where the junctions at which the metals touch are of different temperatures. He noticed that a voltage developed between the junctions proportional to the difference in the heat. The current generated due to the difference in temperature at the junction of two different metals is known as the Seebeck Effect.The Seebeck Effect produces measurable amounts of voltage and current.