How DC electric motor works?

W/ a single loop connected to the power of the direct current, connect to brushes to change the direction of the current giving the loop the force to keep rotating. The loop is inside of a magnet (electro motive force or a magnetic field). As the loop becomes perpendicular to the magnetic field and the T=0, inertia carries the loop forward and the brushes cross the gaps in the ring= current reverse direction.