When the armature is vertical, such that the area of the loop is perpendicular to the magnetic field, the wire is moving parallel to the field, and, therefore, no current is induced in the wire. As it rotates, the segments of wire move relative to the magnetic field, so a current is induced. The current is maximum when segments of the loop have rotated 90 degrees and move perpendicularly relative to the magnetic field. The loop continues to rotate as the current decreases down to zero. The current always flows in the same direction and is known as direct current, or DC.