Keep the following items readily available:
- Sand Paper
- Galvanized Nail
- Coin or piece of Nickel
Cleaning the Equipment
First of all you have to make sure that the equipments you are using are perfectly clean and there should be nothing on their surface which may hinder the flow of electricity. Rub the galvanized nail and the piece of nickel with sand paper so that they become clean and smooth.
Rolling the Lemon
Now the lemon comes into play. Roll it under your hand on a table to make the juice loosen up but without damaging the peel. As the particles of the lemon move around due to rolling, it will result in creating energy.
Connect a voltmeter
As you touch the inserted galvanized nail and nickel, you will feel the current flowing through. Connect the two electrodes of voltmeter; one with nail and the other one with the nickel. The deflection of needle will confirm the presence of current.