<P> A lemon battery is a simple battery often made for the purpose of education . Typically, a piece of zinc metal (such as a galvanized nail) and a piece of copper (such as a penny) are inserted into a lemon and connected by wires . Power generated by reaction of the metals is used to power a small device such as a light emitting diode (LED). </P> <P> The lemon battery is similar to the first electrical battery invented in 1800 by Alessandro Volta, who used brine (salt water) instead of lemon juice . The lemon battery illustrates the type of chemical reaction (oxidation - reduction) that occurs in batteries . The zinc and copper are called the electrodes, and the juice inside the lemon is called the electrolyte . There are many variations of the lemon cell that use different fruits (or liquids) as electrolytes and metals other than zinc and copper as electrodes . </P>

Where does the electricity come from in a lemon battery