but when you reverse the voltage
Why reverse the voltage (AC) ?
..Steve has it right.
Two nails in a bucket of water. High voltage / high amps. One direction (DC).
The idea is that first.. observing the waveform stan provided its not constant dc being applied... because those are graphs of voltage vs time across the cell. .
stan add that diode and i guess the real thing is not actually a diode at least not if you want to accomplish the things he mention... he describes the resonant action as the action of pulling back and forth the atoms and electrons in order to achieve gas on demand. This tell me two things. one is that analyzing the cell and if you apply dc the current has magiorly 3 limiting factors.... diffusion, transport and others polarization is the problem the electrodes covered with the gas get charged to a certain voltage relative to another. the atoms are not allowed to oscillate in this way... however if you could collect for say 95 % percent of the time a certain charge and than bang it with high voltage my best guess is that its going to cause a kind of avalanche effect... of very high probability to generate gas on demand.
It would even explain that the restriction of amps occur in the sense that the there is more product from the reaction than amps flowing in the circuit somehow..