water/electricity analogy
The water analogy is a fine teaching tool, but it is only accurate to a point: Once you get into more complicated principles such as induction coils, the analogy doesn't work anymore, due to the lack of electromagnetic properties of water, ie, flowing water does not create an electric field:
http://www.hattorikogyo.com/ihe/what/ih_diagram.gif
Last edited by Taras B; 24th March 2012 at 15:29.