"Cooling Fan Manufacturer" Peltier thermoelectric power generation relies effect, this effect used on the cpu heat sink and mini fridge semiconductor refrigeration tablets. We usually use electric current is applied to refrigeration tablets, one side will become hot and cold on the other side. However, this effect can also turn: as long as both ends of the cooling chip temperature difference will produce a voltage. "Cooling Fan Manufacturer" different metallic conductor (or semiconductor) having different free electron density (or carrier density), when two dissimilar metals in contact with each other conductors in electrical contact surfaces will be made to a high concentration low concentration diffusion. The diffusion rate is proportional to the electron temperature and the contact area, so long as to maintain the temperature difference between the two metals, can make electronic continued to spread in the other two endpoints of two pieces of metal to form a stable voltage. Thus "Cooling Fan Manufacturer" generated voltage per Kelvin temperature difference is usually only a few micro volts. This effect is usually applied to Seebeck thermocouple, used to directly measure the temperature difference.