At the beginning of the 19th century, was one of the great advances on the way to the electric power generation. It was invented by Alessandro Volta: the stack. This revolutionary object was the first electrochemical device that could be used as a source of electricity, able to deliver energy in a continuous and stable.
From there, the electrical phenomena research advanced rapidly. Some of the most important postulates that could establish were:
the electric charge is in more or less linked nature in the structure of materials, i.e. with greater or lesser ability to move in response to its interaction with electric fields..the negative charge residing on the electrons is, more often, is free, for example in metals. in them, some of the electrons have a degree of freedom like the molecules in a gaseous state. Their movement is erratic, and in gas, not a net sense of movement can be recognized.
Following this series of laws, you could discover that when you install a field within a metallic conductor, particles tend to follow preferably the signal from the field and can then be a sense of movement in their movements. This is what we call electric current.
Like most of the drivers of electric circuits are metallic, it is necessary to be in them the sense real or physical movement of the electrons against the electric field.
In the electrolyte or gaseous conductors, the charge carriers can also be positive, so that their displacement is contrary to the previous.
For simplicity, establishing a conventional sense of the current movement and is the positive charge carriers, i.e. in favour of the electric field.
Do do is defined as the electrical current to the ratio between the NET burden ? q that crosses a certain section of the driver per unit time? t. In symbols:
The unit of electric current is the ampere (A) that corresponds to a constant current which a load of a coulomb is going through any normal section of the driver by every second.
Its name was chosen in homage to the contributions of the French André Marie Ampère (1775-1836), who at the beginning of the 19th century established the principles of electrodynamics, relating the concepts of electricity and electrical potential, and also made other important contributions in the theory of electricity and magnetism.
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