Answer:
A battery made out of a lemon is a gimmick used in various textbooks in schools all over the world.
The experiment usually consist of using two various metal conductors, it could be a nail covered with zinc (galvanized) and a quarter or any other
coin made out of copper. You will then have to insert the two items into the lemon. The coin and the nail will become electrodes and cause a kind of electrochemical reaction
and generate a minor electric potential. The reason for caring out experiments like this is to demonstrate for the pupils or students how a normal day battery works. When the lemon battery is put
together, a device called a multimeter will be able to the amount of voltage generated.