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If you connect a series of apples together with copper wire (using a nickel nail on one side and a steel nail on the other to make the connections into the apple), then this creates a difference in voltage between the two ends of the system which can be used to power a device.
Try using 10 apples and a 2v bulb - you can do without the different nails, they just improve efficiency.
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∙ 13y ago
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