Alex S Research
This website had no pictures or diagrams, but that was totally awright, because it had a few very detailed videos, showing you step by step of how to make a potater battery.
This site actually gave incredibly simple, easy to read, and short descriptions of potato batteries, what you need, and how to make one. It also said what the science behind it was - which i spent an hour or so googling.

"A potato battery is an electrochemical battery, otherwise known as an electrochemical cell. An electrochemical cell is a cell in which chemical energy is converted to electric energy by a spontaneous electron transfer. In the case of the potato, the zinc in the nail reacts with the copper wire. The potato acts as a sort of buffer between the zinc ions and the copper ions. The zinc and copper ions would still react if they touched within the potato but they would only generate heat. Since the potato keeps them apart, the electron transfer has to take place over the copper wires of the circuit, which channels the energy into the clock. Presto! You have potato power" -

I - Batteries: A battery is a commonly cylindrical power source. It’s used in radios, CD players, game consoles, lights, lamp, toys, and cameras. They generate power and electricity. Also, there are larger, differently shaped batteries, such as car batteries. A battery is made up of two or more cells. The dictionary definition of a battery is “Two or more connected cells that produce a direct current by converting chemical energy to electrical energy.” A standard issue AA battery puts out 1.5 volts. In 1748, Ben Franklin first came up with the term “battery” to describe electrically charged glass plates. In 1859, Gaston Plante of France came up with the first lead-acid battery, which is basically what we use today. Today, in 2008, we have many different brands, types, sizes, colors, and so many varieties beyond those.
II - Potatoes: A potato, also known as a potater, a tator, or a tatoe, is something far beyond a funny word. A potato is a vegetable, which means it comes from the ground. Potatoes are brown, hard, and are generally dirty. They can be cut and cooked in hundreds of different ways, and eaten with different foods. Above these many edible versions of the potato, there’s also games and songs that are based upon the potato. There are games like “Hot Potato” in which the object is to keep passing the potato, hold it as little as possible, but whatever you do, do not let it fall. Then there’s a children’s song, called “One Potato, two potato.” The song is simple; you sing “One potato, two potato, three potato, four. Five potato, six potato, seven potato, more!” All the while, you have both your hands in fists, and keep putting one on top of the other. As you can see, the potato is a very popular vegetable; clearly a celebrity among the Plantae kingdom, and also a hit all around the world. Obviously a super vegetable, toy, and song theme.
III - Potato Batteres: Now wait, there are many more important things a potato can do. One such skill is act as a battery. If you cut a potato in half, stick a thick copper wire or penny in each half, then stick a galvanized nail out of the back of each half, you have two functioning batteries, putting out up to two volts! Now, you just connect the potatoes with alligator clips, clipping one nail to another, and clip all the pennies or copper wires to whatever you intend to power.
The potato battery is cheap, easy to make, and somewhat edible. Also, the more potatoes you can connect, the more volts you will have, and no matter how many potatoes you waste, it’s not a crisis, because instead of being manufactured, they are grown. A potato battery is what's called an electrochemical battery, which means it takes the chemicals in the potato, and uses the galvanized metal and copper to convert it into electrical energy.

Unfortunately, i was unable to paste my diagram into the wiki.

Also, Ms. Thomas, i could not find the science behind the potato battery, and why this funny veggie doubles as a battery - everything i googled came up with pictures, videos, and diagrams showing me how to make one. I googled "How a Potato Battery works," "Why a potato battery works," "The science behind a potato battery" "The effect of galvanized nails and copper on potatoes," and a few other things i cant remember off the top of my head. I went to the first page of google results for each of the searches - i just couldn't find anything.

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