This is a wonderful interactive on electric circuits called The Blobz Guide to Electric Circuits. This guide includes sections about how circuits work, switches, changing circuits and more. It also offers an activity and quiz! It’s definitely worth checking out!
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Another good one, on the same theme is this one from the BBC:
http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/changing_circuits/play_popup.shtml
Thanks for sharing this, Jonathan!