How does wiring a potato make electricity?
My son wants to try this
A potential difference can be generated several ways. One of the most common is by chemical means. A chemical cell is constructed using two dissimilar metals submersed into an acid or alkaline solution. The electrolyte in the potato serves as a medium through which electrons can flow between the two metals.
http://cosmology.berkeley.edu/Education/DEMOS/Potato_Power/Potato_Teacher.html
You can also use lemons, or any citrus fruit. One of my professors once told me that he used to win bar bets but telling people ge could light up a light bulb in their drink. He carried around a very low current bulb that had zinc & copper wires soldered into the contacts. Of course the drink in question would have to have a high fruit juice content (or be acid/alkaline by some other means), and not being a drinker I would have no idea which drinks would be the best “bet winners”.