The electricity and electromagnetism are two branches of the physics. The electrical and magnetic phenomena began to study towards end of century XVIII, when in 1785 the French physicist Charles de Coulomb confirmed that the electrical repulsion or attractive force is directly proportional to the product of the masses and inversely proportional to the squared one of the distance separates that them. This was denominated like the Law of Coulomb. very low frequency Nevertheless, was the mathematicians Simen Denis Poisson and Carl Friedrich Gaussian who reached the conclusion that two particles with opposite loads are attracted, accelerating one towards the other. From the classic theory of a simple circuit is born here (passage or route of an electrical current), that it postulates that both poles of a battery have opposite loads (positive and negative). When these poles are connected from a conductor, the negative particles are attracted by the positive pole, warming up the conductor, question that happens because it puts resistance to the movement..