The steel shaft carries a clock spring with a free wheel device, winding ratchet and aa 56mm diameter aluminium 'V' pulley.
conversion of potential energy in a wound-up spring to electrical energy.
This could also be used to wind a weight on a cord showing the change from potential energy to kinetic, and back, in the raised weight.
Supplied complete with driving belt.
All units have a base measurement of 165 x 100mm and have 4mm socket terminals where appropriate.
The Energy Transfer Kit consists of a number of separately available units which enable the user to show conversions of one form of energy to another in a variety of different ways.

Physics School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Spring Unit Energy Transfer Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities