Hey, I need to make an AC Generator for a school physics assignment. It will be marked on how much voltage it generates. I will be doing this using induction with the following equipment: * Permanent magnet * Coil/Wire * Iron Core * Split Rings/Brushes ? My questions are: * What's the best material for the coil/wire? * How can I make a good iron-core? * When constructing the coil, does it matter if the coil is wounded so that it is touching itself throughout the iron-core (ie. there is no visible spacing between the coils/turns)? * Are split rings/brushes necessary? What are they for? Any help is appreciated.