To make a potato battery, you’re going to need a potato, some copper pennies, zinc washers, some test leads, an LED or other device to power, and a multimeter if you happen to have one. Now, if you don’t have any pennies or washers, you could substitute copper wire or galvanized nails for example.
The first step is to cut our potato in half, then make some slits in the top for our electrodes. Insert our penny cathode and washer anodes into the potato, leaving only about an 1/10th of an inch exposed. The acid in our potato acts as an electrolyte between our two electrodes, so we want as much of the metals surface touching the potato as possible.
Take one of your test leads and connect the zinc anode of one potato to the copper cathode of the other potato. If you have a multimeter, now is a good time to attach it. Mine gave me a reading of 1.5 volts. That’s amazing.
However, our LED requires a minimum of 2 volts to operate, so you know what that means?! Add more potatoes! And this time it lights right up, giving us a nice blue glow! Now what would you say if I told you that the potato is completely unnecessary, and provides none of the actual electricity? Watch my next video “How to make a Penny Battery” to find out more!