Go to http://www.deltamicro.co.uk/primary_online/circuits.html for a fantasic site that can be used on a whiteboard, demonstrating how to build a simple circuit. A light, battery and motor can be dragged onto a simple circuit with an on-and-off switch. A great way to allow pupils to test whether the circuit they build actually works.
Or go to http://www.engineeringinteract.org/resources/siliconspies/flash/concepts/simplecircuits.htm for another interactive lesson for the whiteboard showing how to build a simple circuit.
Both these websites are suitable for primary school level. They are easy to understand, and the pupil involvement is great.
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