A direct current, which is the focus of this section, is one that flows in one direction. There are two basic direct current circuits of importance to us: those with two or more resistors connected in...A direct current, which is the focus of this section, is one that flows in one direction. There are two basic direct current circuits of importance to us: those with two or more resistors connected in a series, and those with two or more resistors arranged parallel to each other. Other direct current circuits can be understood in terms of these two basic circuits.