schoolscienceproject.blogspot.in
Electricity Potato battery
Stick
finger-length pieces of copper and zinc wire one at a time into a raw potato.
If you hold an earphone on the wires, you will hear distinct crackling. An
electric current causes the noise. The potato and wires produce an electric
current in the same way as a torch battery, but only a very weak one. The sap
of the potato reacts with the metals in a chemical process and also produces
electrical energy. We speak of a galvanic cell because the Italian doctor
Galvani first observed this process in a similar experiment in 1789.
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