And this is our outside system that receives electricity in the form of moving electrons. Now, like always, like most cases, our anode is negatively charged and out cathode is positively charged. And that's why electrons travel from the negative charge to the positive charge. Now, inside our anode, we need to allow H two molecules in the gas state in. And that's why we have an outside power source that allows those H two irons or H two molecules inside our anode. And to make sure our pressure is not increasing, make sure there's no build up in pressure, this needs to be released back into some outside location.