The amount of your solutions is proportional to the current, and when two or even more electrolytic cells are linked in collection to the exact same electricity resource, the solutions produced during the cells are proportional for their equal excess weight. These are typically called Faraday's regulations of electrolysis. First https://spencerhugrc.wikifordummies.com/8926274/getting_my_industrial_pem_electrolysis_to_work