Here's the copper -- copper sulfate solution, which H2SO4, and here are my plates, this is my zinc plate, and this is my copper plate, and you are going to see the voltage displayed, I think, over there, that is correct -- there's no potential difference now, because they're not in place yet, and so here comes my my zinc, and here comes my copper, and they go into the solution, and you see about one volt. 