Here you can impart an idea of the relative values of different efficiencies. Having such an idea for different devices and...

Classroom Activity 14-16

Practical measurements and calculations as exemplars to learn from. In this activity a motor is used to lift a load.

Classroom Activity 14-16

When comparing the power figures of appliances, it is important to stress the point that the figures quoted need to be...

Teaching Guidance 11-14