This project for students who wants to study and measure different flow of electrons in fruit and vegetable. It is very interesting project and would be a great learning experience for everyone. The best part about this project is that you do not need too many things for this project. You only need a copper and zinc electrode, voltage meter and various vegetables and fruits. And to start your experiment you need to put both zinc and copper electrodes into the fruit or vegetable and attach voltage meter wires with it. Students will measure the amount of electricity produced by various fruits and vegetables. Results can be noted down into notebook or can be shared via email. The project involves measuring, organizing, analyzing, communicating and interpreting data. If voltage meter is not available you can use small led lights too. Though LED lights are cheaper but with them, you will not able to measure exact voltage.
Many of you may be surprised by this experiment as if fruits and vegetables actually generate electricity?
Let me explain you this, as you put zinc electrode into the fruit, it starts getting oxidized (as shown in the reaction below) and in that process it generates electrons which travels through the wires just like a battery does. In lemon battery, electrolyte is citric acid which is available in abundance in lemon.
Zn → Zn2+ + 2e−
This method is related to first battery which was created by Mr. Alessandro Volta in 1800 but still this is still interesting project and can be used in any science fair for the kid’s age below 10 years. This experiment also helps in understanding battery mechanism.
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