Thermoelectric devices are seen very often in various appliances: small refrigerators, semiconductor chip coolers, medical chillers. The thermoelectric effect works in both directions – it can generate temperature difference when current flows, or it can induce current when the temperature difference is applied. About thermoelectric effect It is known for more than 100 years. Several scientists discovered this effect in one or another way. Probably you’ve heard the Peltier effect. Jean Charles Athanase Peltier discovered that if you apply an electrical current to two materials’ junction, it gets cold or hot (depending on current direction).