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The potato-battery experiment only generates about 1.5 volts a few milliamps. For a 40W incadescant bulb you typically need 120V and about 330 mas. If you could control all your losses in circuitry and somehow group the potatoes in series you would need about 160 potatoes. Wire 80 in series and parallel that with another 80 in series. This will provide DC vice AC. You need the proper anode and cathode and proper gauge wire. 40W isn't practical application. Try smaller bulb for starters and work your way up.

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14y ago

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