What time is it? Find out with the amazing Green Science Potato Clock! Using NO batteries ! Be a scientist as you discover how to power this digital clock using potatoes. Experiment to find out what substances will power the clock- you’ll be AMAZED. 
- An electrochemical battery stores chemical energy that changes into electrical energy that runs electronic equipment. There is a chemical reaction within the potato battery that causes the electrons to move. The electromotive force within each potato is the ability it carries to move electric current. In an electrochemical cell, such as the potato battery, the copper wire makes the electrons move in the potato, causing energy to move into the clock.
The official scientific name for the chemical reaction is “redox reaction.” The process starts when one side of the battery loses electrons. This happens in the the zinc nail, which forms the anode, or positive part of the circuit. The zinc in the nail reacts with phosphoric acid in the potato, releasing electrons. The zinc electron loses 2 electrons while the copper in the wire reacts with the phosphoric acid to release hydrogen ions, which gain the electrons. This is the negative half of the circuit, or the cathode, which thereby gains the electrons. WOW science is cool!
