The electric current in an electric circuit is symbolized by the direction of the electrons through the circuit.
The electrons flow at a speed of 0.001m / s (depending the wire and insolation composition), while the electromagnetic waves propagate at a speed of 300.000 Km/s, from the voltage source to the electric resistance, and after, to finish in the opposite pole of the electricity source.
There are two ways of seeing this direction of the electric current, for the one hand we have the clasical form and for the other the conventional form. In this representation the electric current flow from the positive pole to the negative pole. This direction of the electric current is not real although in many documents and explanations is as shown.
The other way of representing the direction of the electric current is the real representation, we call it real representation because it is the direction that the electrons have when they flows physically through the electric circuit.
These two ways of representation the electric current exist because formerly it was thought that the direction of the electric current flow from the positive pole to the negative pole, and after seeing in the different electric diagrams this direction we assimilate it as normal form for the electric current. However it is later discovered that the correct direction of the current is from the negative pole to the positive pole. For this reason there are two ways for representation the electric current, sometimes leading to confusion.