Direct Current (DC)

An electric current, ie the unidirectional flow or movement of electric charge carriers (electrons or ions, or both), which flow uniformly, from the negative pole of an electrical power source (eg a battery) via an electric circuit to its positive pole, or vice versa (positive pole to the negative pole). When the electrical power poles are fixed, the positive pole is always positive, and the negative pole is always negative. Therefore, the direction of the electric current does not change.