[header] How to create a potato battery [title] Gather the necessary materials. [step] To make a single potato battery you will need a potato, a galvanized nail, a copper coin, two alligator clip leads with clips on both ends, and a voltmeter. [substeps] Galvanized nails are standard nails that have a zinc coating. 
They can be purchased at any hardware or home improvement store. Use a fresh potato as the experiment depends upon the juices inside the potato.