Lemon battery

[Magical Realist]

I was thinking of sticking a copper nail and a zinc nail into a lemon and connecting an LED between them. Would it be enough to light it? Find out here:

http://hilaroad.com/camp/projects/lemon/...ttery.html

Better yet, create some LEDs with a zinc coated and copper coated lead, then poke them all into the lemons of a lemon tree. Naturally powered christmas decoration!

[elte]

That would be a good science fair project.  I recalled potatoes being used also, and I found a link.

http://www.miniscience.com/projects/PotatoElectricity/

[Magical Realist]

That would be a good science fair project.  I recalled potatoes being used also, and I found a link.

http://www.miniscience.com/projects/PotatoElectricity/

Wow...a potato creates even more voltage. I wonder how much a grapefruit generates? A pineapple?

[elte]

I found it surprising that it was higher for potatoes than lemons too.

I wonder how long a vinegar or muriatic acid battery would light an LED.  Vinegar in a plastic container, for example.  

Or maybe a solar cell charging a super capacitor.  Would the capacitor store enough charge to light an LED overnight?