Battery - Lemon, Potato, Beer, etc?

I'm after information on the internet on batteries powered by lemons, potatoes, beer and all soughts of other things. I'm after info on how they work, scientific explanation, etc. I haven't managed the find anything. Could someone please help me. Best answer - 10pts

Answer:
the probes you use( positive negative) whether they are iron or copper, aluminum etc. all have a negative or positive polarity. In a acid or base solution( lemon potato or beer) the acid reacts with a metal creating a negative or postiive ion which propigates to the probe creating a simple battery
a potato is a base solution, a lemon is an acid solution

http://en.wikipedia.org/wiki/battery_%28...

or just visit www.wikipedia.org
type battery in the search box and select battery "electricity from the list
then scroll down to home made cells

the best try these ( they give you every detail)
http://pbskids.org/zoom/activities/pheno...
and
http://www.ushistory.org/franklin/fun/le...

I made a battery instead of the transformer I was making but it didn't work too good or I should say it worked too good. I think I could make it work if I go back to trying though. More info at http://www.geocities.com/tired94302... my website.

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Battery - Lemon, Potato, Beer, etc?

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