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I have been working on making a workshop. First I wanted to use potatoes to power sound generators, but I realized that the potatoes do not make enough current. I need like hundreds to make decent current. With a parallel/serial combo configuration I was able to make roughly 1.5V with something less than 1mA. This is enough to power a low-voltage piezo buzzer. It’s faint but it will do! I tried lemons and different cuts for both the lemons and potatoes, but so far the whole potatoes seem to work the best. It maybe a matter of opinion but powering something with potatoes seem more exciting than lemons!