Thermoelectric Converter 
suitable for KS3 +. A series of semiconducting junction plates is sandwiched between 2 aluminum heat-conducting plates. When a temperature difference exists between the 2 sides of the junction plate, electric current is generated to drive a little fan, providing a visual demonstration of the current produced. There is a switch on the ermoconverter to switch the junction plates between the motor fan or a pair of 4mm sockets. When the 4mm sockets pair are selected and driven with a 5V DC voltage, a temperature difference will be created and conducted by the aluminium plates.