Eb-3 Faraday's Wheel

Aim

To demonstrate the production of a continuous current (D.C.) by means of electromagnetic induction.

Apparatus

Faraday's wheel apparatus
Mercury from chemical cupboard
Demonstration galvanometer or
Electronic galvanometer
A.C. motor and P.V.C. tubing

Faradays Wheel

Faraday's Wheel

Description

Faraday's wheel consists of a disc capable of rotation about a horizontal axis. The disc rotates between the poles of a strong permanent magnet. Connections are made to the rim of the disc and the axle by aid of perspex cups containing mercury into which the discs A and B make contact.

The galvanometer is connected to the cups and the disc is spun by the connection of a small length of P.V.C. tubing between the axle and the A.C. motor. The variac controls the speed of the motor.