I run 12 amps through an electromagnet that's 5 ohms. I have a large transformer core, large gauge magnet wire, a high current/high voltage bridge rectifier, and high voltage capacitors. What I can't seem to figure out is the amount of turns I should have on my transformer for both the secondary and primary. I can't seem to wrap my head around the dynamics of rectifying Ac to dc under a load. My main Ac supply is 120 Vrms.