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The critical thing in a battery is not how much electrolyte (potato) is used but the area of the electrodes in contact with the electrolyte.

A high current "potato battery" could be constructed by pureeing a few potatoes in a blender and coating long foil strips of the two different metals with a thin layer of this damp potato paste and cover the potato paste with tissue paper as an insulator to prevent short circuits followed by another thin layer of damp potato paste. Roll the layered sandwich of coated foil strips up (one metal, damp potato paste, tissue paper, damp potato paste, other metal, damp potato paste, tissue paper, damp potato paste), without letting the potato paste squeeze out or wrinkling the foil strips. The thinner the layers of the damp potato paste used the fewer potatoes needed, but the current will be the same as it would be with a thicker layer. Attach wires to the two foil strips and encapsulate the "potato dry cell" you have just made in paraffin to keep it from drying out. You will need to build several of these and connect them in series to get the voltage needed by your lightbulb. It will require some calculations to determine how much of each of the materials (i.e. dimensions of metal strips, potato puree, tissue paper) needed, but that is beyond the scope of this website.

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9y ago

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