I just made a couple of changes to the setup in this video and here are the current measurements. I added two 220 ohms 5W resistors to the primary, one resistor on each side to limit the primary current. I took a current measurement on the primary with 120VAC RMS @ 60Hz and the current was 72mA through the primary. I also took a current reading on the secondary side of the transformer before the diode and measured 128mA with 25VAC @ 60Hz. I then took a current measurement between the diode and L1 choke and it measured 105mA with 10.5VDC @ 120Hz. Also took a current measurement on between the secondary and L2 and it measured 128mA with 25VAC @ 60Hz. The transformer is a 21:1 set-down. I get a nice stream of HHO and I let it run for 20 mins and the water temp hasn't increased at all.