galvanic Current in the Human Body - A Science Fair task

Aim:

To prove that the human body is able to produce electric current with the help of a simple experiment.

SHOCK YOU LIKE AN ELECTRIC EEL

Materials Required:

1.A plate made of copper and another made of aluminum.
2.Dc micro ammeter to measure current's intensity.
3.A combine of crocodile clips.
4.Wire made of lead.
5.Two pieces of wood.

Procedure:

1.Take the copper and aluminum metal plates and mount them on the two pieces of wood, kept apart.

2.Using hookup wire and crocodile clips associate the two terminals of the Dc micro ammeter to the two plates. The Dc micro ammeter is used to measure electric current in a closed circuit. It is available in any local electrical shop.

3.Now mount each of your hand on both the plates. We will see that the ammeter shows deflection. If it does not show any reading then reassemble by reversing the connection. If it still doesn't show any deflection then plates need to be cleaned.

4.Now drench both hands and place again on the metal plates. Is there any incompatibility in the meter reading? If so is it more than what we got with dry hand?

Scientific Explanation:

We see that there is slight deflection in the ammeter reading. The reckon is because there is a thin film of sweat in our hands and the same acts as acid like in a battery. This results in a chemical reaction with both the plates- the copper and aluminum plate. In the process our hand gets negatively charged by taking a negatively charged subatomic particle (electron) from copper. The aluminum metal on the other hand gets negatively charged as an electron is donated by the other hand to the aluminum metal plate. This incompatibility in fee (also known as inherent difference) results in an electric current which is shown by deflection in the ammeter.

When both hands are wet we get a higher reading. It is because our body acts as a resistor while water reduces this resistance important to growth in current flow.

galvanic Current in the Human Body - A Science Fair task

SHOCK YOU LIKE AN ELECTRIC EEL