Hi all, I just bounced some questions off an electrician and want to know what you think. Please feel free to fill me in where I lack knowledge, but...

A PWM is used mainly to control the amount of amperage flowing to the reactor in an HHO setup right? I know that there are other HHO applications too, but say I just want to focus on controlling amps for now.
Has anyone ever tried using a rheostat to control the amperage going to the reactor? It costs less than a PWM, and is designed to limit amperage flow, so why not use it in this application? I would greatly prefer having to use one of these, over messing with the electrolyte in order to dial in a certain amperage for my cell.
Am I missing something here?