Demonstration dynamo, AC/DC

Specifications

It shows the conversion of mechanical energy into electrical energy and the principle of operation of simple dynamos. The whole instrument is mounted on a base and is capable of generating AC and Dc current simultaneously as it is shown by the illumination of a couple of light bulbs placed at the base.
The equipment consists of an isolated copper wire coil mounted on a support that is placed between two curved metal strips; the support presents a commutator for DC output on one side and a commutator for AC output on the other side.
A permanent magnet placed at the top of the metal strips generates the magnetic field.
The instrument is completed with a hand operated pulley connect to the coil support through a rubber belt.