Experiments in Electrochemistry
Lithium battery: Put a piece of copper plate on a wooden base, then put on top of it a strip of filter paper soaked with saturated copper sulfate solution and a piece of lithium that has been hammered flat. When you measure the potential-difference between the two metals, you will find a voltage of 3.4 V - enough to run a small electric motor with this battery.
Grapefruit Battery How to produce a 9 to 13 volt battery out of a single grapefruit.
A Dry Cell Battery: Charcoal with Aluminum foil
Electroplating: Nickel plate an object.