Circuits and Conductors http://www.bbc.co.uk/schools/ks2bitesize/science/activities/conductors.shtml
Changing Circuits http://www.bbc.co.uk/schools/ks2bitesize/science/activities/changing_circuits.shtml
Video: Electromagnets http://videos.howstuffworks.com/hsw/18097-electricity-and-magnetism-electromagnets-video.htm