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Generating electricity with copper and zinc
This is a very simple battery design. A piece of wet paper (dipped in vinegar) acts as an electrolyte, drawing electrons from the metals and creating an electrical current. All you need to do this are copper and zinc (or copper and nickel - copper can be found in a penny), and a piece of vinegar saturated paper.
[WARNING: Build and operate this circuit at your own risk! The author accepts NO RESPONSIBILITY for injury, loss of life or any form of damage caused as a result of following the instructions on this page. While this circuit is probably safe to operate, you should not attempt to use it without first having an understanding of electronics. This circuit HAS NOT BEEN TESTED and is not guaranteed to work correctly if at all]
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Generating electricity with copper and zinc