Does anyone know the actual difference between PRIMARY CURRENT AND SECONDARY CURRENT? READ about the LAWS OF ELECTRICAL properties ! HIGH voltage equals low amperage, it works the same no matter what you are working with, be it AC when you switch the connections to you air compressor that either runs on 120 or 240, it's stamped right on the metal tag on the motor, for 240vac the amperage is half of what it is for 120 ! LOOK IT UP IN the NEC manual. Hell look it up on the internet since you're already here. Get a real education from someone that knows what the hell they are talking about or do think your smarter than they are? As for me, I work on vehicles for a living, been doing it for almost 50 years, using scopes and solving problems with ECM systems everyday. I have also possessed an electricians license, spent time in college studying electronics including computers, designed circuits for control systems and even work on huge commercial wind turbines. I've been a fleet maint super. for a national trucking company. Back to the topic of amps and volts, yep, it takes amps on the primary side to produce high voltage on the secondary side. You don't get something for nothing. Get the facts straight first.