Hey so I'm trying to build a few poweful electromagnets and I need some help because i don't really know much about the topic. What gives an electromagnet more power? Number of wire turns? Multiple layers of wire turns? Is it amps or volts that gives them their drive? Also what's the best gauge of wire? I'm using 22 AWG enameled magnet wire right now on a two inch diameter iron rod. I'm thinking of moving up to 20 or 18 gauge wire but I'm not sure if that would be better. Any help you can give me would be great! Thanks!