There's a confusion before I proceed to the experiment of "Generate electricity out of Salt water" -The variation types of metal that I can choose for replacing "Copper" and "Zinc" from the periodic table. How do I determine which combination will ends up with the maximum efficiency? -How long the metal will last to be effective (While Im replacing the electrolytes) (This could be a dumb question due to, Im having no Chemistry knowledge) Uhmm guys? Im in the correct section? Is this to be in the Chemistry section ??