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· A real Quack!
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gspig said:
A zinc rod and a copper rod driven into the ground is a simple battery. A zinc strip and a copper strip placed in a potato will power a small clock.
My kids and I did this last year for a science project, sliced up an orange or grapefruit, stuck a copper wire on one side, and a dissimilar metal (steel, zinc, etc) on the other. Then we wired them in series and lit a 3volt LED. Each "cell" produced about 1/2 a volt.

I would imagine if you stuck copper & zinc rods in the earth and watered them with a strong acid, you'd get some voltage, but not enough to do anything practical. The cost of the copper & zinc, and the frequency of replacement of the rods makes it pretty impractical & expensive.
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