Physics > Electricity & Electronics > Demonstration Models

Mounted on wooden base, workable on 4-6 volts D.C. with Newton's Colour disc.

For the study of the fundamental principals of electric motor and generators. The motor consists of a two-pole D.C. armature. The brush holder, with two heavy binding post terminals, may be rotated for experiments. The permanent bar magnets are supported by spring brass clamps which are un-adjustable in the horizontal plane to show the effects of pole separation. Complete with two bar magnets, a two-pole D.C. armature.

A model of the simplest form of D.C. electric motor, having 2-pole armature wound with enamelled copper wire, and a permanent magnetic field provided by a removable bar magnet. The construction of the model is completely open and all components are readily observable. A disc-type commulator is incorporated and external connection to the phosphorous bronze bushes is by means of a pair of 4mm sockets. The motor will operates on 6-8 volts DC.

With wheel, to generate alternating current (A.C.) and direct current (D.C.) represented by two lamp holders and bulbs marked A.C. and D.C., with the help of driving wheel. Mounted on polished wooden base.

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