You might also try this video from Khan Academy. https://www.khanacademy.org/science/physics/electricity-and-magnetism/v/cir= cuits-part-1 The preceeding videos in the "Electricity and magnetism" topic may also be useful. --=20 James Cameron http://quozl.linux.org.au/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .