ChemIONS

i saw an ipod charger using an onion and two wires. can anybody know how it works??? can i use this onion charger for my ipod? what is the basics. is it ok to use this raw charger? any problem for the ipod?

Ok for your iPod, well, that one I cannot comment on; however, your onion is making a simple galvanic cell. The two wires are made from different metals. The onion is moist and contains electrolytes. This enables a current to flow from one wire to the other. How much current and the direction of the current depends on the two types of metals. Don't like the onion - try a potato, lemon, apple, or anything like that! Heck, if you have the right metals - a damp sponge with a little salt and a spritz of vinegar will do just fine!