The movement of electric charge is known as an electric current, the intensity of which is usually measured in amperes.Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. By historical convention, a positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part.
The motion of negatively charged electrons around an electric circuit, one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of the electrons.However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once.
Increasingly, however, his task is not only the installation and repair of electrical installations as well as for solving a variety of problems with the existing installations.
Electricians installations also involved in other, less associated with electrical devices such as intercoms or monitoring.Often, as far as their powers, electrician designs the future electrical installations.
There are even special systems that allow long phase justification of the amount of light waiting to drive through the intersection cars.