Potato battery science project.

Potato battery science project is a simple experiment which demonstrates how a pair of different metals and electrolyte can produce electric current. It's fun and safe. It can be done in various forms for different grades.

Following materials and equipment required for the project:

potato battery

If you add some other things to the list, you'll be able to make series of interesting experiments.

Here is possible additions list:

Low voltage calculator and/or digital clock, lemons and/or other fruits, 3 plastic cups, fresh water, salty water, water with some vinegar, iron wire or nails, aluminium wire or foil.

Experiment setup:

This is pretty much it. Now you can start measuring voltage of your brand new potato battery.

First attach your multimeter clips to the wire and nail on one potato - you should see a voltage somewhere between 0.9 - 1.1 volt - this is typical for a single sync-copper potato energy cell. Note that value may be positive (0.9V) or negative (-0.9V). This is because we have DC type of current here unlike current in the typical wall outlet which is AC.

potato battery

Now try to measure combined voltage from all three potato batteries. If everything is connected correctly you'll get slightly less or more 3 volts. The amperage of this current is very low and not enough to light a typical low volt light bulb. However it could be enough to power up a calculator or digital clock which need very small amount of energy to run. Try to connect nail and wires from the potato battery and power terminals of this devices and see if that will work. Remember that potato battery just like usual battery has positive and negative polarity.

potato battery

Now it's time to try some variations of this experiments and tests some hypothesis

Try to answer some of the following questions:

potato battery potato battery

Let's investigate