Thread: 204 Simple Science Experiments ~ {ERG}
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Old 05-14-2008, 01:39 PM
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Default Re: 204 Simple Science Experiments ~ {ERG}

28. 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.