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The problem with that is you need DC current to separate the molecules. The oxygen and hydrogen are each drawn to a positive or negative anode, respectively. With AC current the atoms would be constantly switching which direction they are traveling, which would result in a lot of nothing. I think that is how it would work anyway, haven't done this stuff in years. The rectifier you mentioned should work. All you need is DC with enough voltage and amps to reach the other cathode. If I remember correctly a higher wattage actually speeds up the process, but I didn't do many experiments in that area.
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