What is the significance of the lemon battery?

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bandmanjoe | Middle School Teacher | (Level 2) Senior Educator

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The significance of the lemon battery is that it demonstrates how electricity may flow across a small electrical potential difference.  A strip of zinc and a nail are inserted into a lemon.  They react with the lemon juice to serve as a cathode (+) and an anion (-) across which a flow of electrons may travel, strong enough to light a small light bulb.