Q.No.178: - What reverses the direction of electric current in the armature coil of D.C. motor?

Q.No.178: - What reverses the direction of electric current in the armature coil of D.C. motor?

Ans: - To reverse the direction of current, the connection to coil is made through an arrangement of brushes and a ring that is split into halves, called a split ring commutator. Brushes which are usually pieces of graphite make contact with the commutator and allow current to flow into the loop. As the loop rotates, so does the commutator. The split ring is arranged so that each half of the commutator changes brushes just as the coil reaches the vertical position. Changing brushes reverse the current in the loop.