In a DC motor, what role does the split-ring commutator play?

1. The split-ring commutator is a metal ring cut into two halves. 2. As the armature rotates, the brushes contact each half in turn. 3. This reverses the direction of current through the armature every half rotation. 4. Reversing the current keeps the torque acting in the same rotational direction. 5. Without the commutator, the motor would stop oscillating. 6. So the commutator reverses current direction every half rotation. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_