This set is used for study the AC/DC generator. The dynamo consists of copper coil and magnetic bar. There is transparent plastic covers the handle that connects to spindle of dynamo, circuit board and arrow shape LED that shows the direction of electrical current, 2 sets. Each set shows opposite direction. Base size is 40x45x20 cm. Back drop is 45x34 cm. It is made from MDF plywood coated by Formica.