Sorry for posting so late on your posts, Fabio.
I was on holiday with the family
First things first. The bif coil must have a load, otherwise no current will flow and no magnetic field will be created and as such, no current restriction will happen, like Meyer said.
Current control was one of his goals.
He didnt want to use a resistor, so the only other logic component was frequency and bif coils. I seen the restriction that a bif coil can create if you hit the right frequency. You see the current go down.
I also saw the hydrogen production go down
cheers!