Editing Thermal Fan (section)

== Why This Works ==

The Thermal Fan is a classic demonstration that shows an energy transfer. The ''Seebeck Effect'' is when an electric potential is produced across a metal surface due to a difference in temperature. As heat energy is transferred through the metal, the heat energy has a corresponding electric current. This effect is seen with the Thermal Fan as it starts to spin. The fan has a leg in boiling water and a leg in ice water. As the heat travels from the boiling water to the ice water, it passes through a circuit in the center, which is connected to the fan motor. This circuit can detect the electric current produced by the temperature difference, and since one leg has a low electric potential and the other has a high electric potential, the circuit will collect and use the electric current to power the fan, making it spin!