What is electricity?

This discipline, which depends on physics, deals with the study of electric charges and phenomena arising from the interaction between them. Subatomic particles can have a positive charge, such as protons, or negative, such as electrons. In the event that these particles are identical charges repel and, conversely, if the charges are different attract. If a driver is placed between two electrically charged bodies of the same intensity and opposite sign is generated an electric current. This consists of a flow of electrons that go from the negatively charged body which has a positive charge. In step three phenomena affecting the flow: the potential difference between the charges, the intensity of the current and the resistance of the driver on it.

How do you express the potential difference?

Between two points of a tour conductor an electric current is always observed a potential difference, corresponding to the energy lost. This variation is expressed by Ohm's law, that the potential difference between the extremes of resistance is the product of this resistance by the current intensity that passes through.

By pulling a wool sweater passing through his hair, it may crackle and even sometimes cause sparks. This is due to the presence of an electric charge generated by the attraction of the electrons.

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