School of Physics Lecture Demonstration Manual

Ea-2 Barlow's Wheel

Published: Tuesday 14 March 2006 - Updated: Tuesday 29 March 2011

Aim

To demonstrate a simple electric motor.

Apparatus

Diagrams

Click on pictures to enlarge.

Barlow's Wheel Diagram

Videos

Barlow's Wheel

Description

Mercury stored in the chemical cupboard is poured into the trough located on the base of the apparatus. The wheel is lowered until a spoke just dips into the mercury. The voltage from the PowerPak is applied to the binding posts and increased until rotation of the wheel occurs. It may be necessary to give the wheel an initial push to overcome friction.

Safety notes

Electrical Safety 

Chemical Safety 

Maintenance 

top of page