Show the conversion of mechanical energy into electric energy and principle of working of simple AC and DC Dynamo. This model uses the basic assembly as the motor, but is mounted on a base- plate 230 x 90 mm approximate, which also carries a hand-drive pulley 120 mm dia. coupled to the smaller dynamo pulley by a rubber belt to give a step- up ratio. Electrical output is via a pair of 4 mm sockets and a light emitting diode is provided as simple output indicator. The model may also be used as a motor on a 6-8 V D.C. supply.