In general, DC electric motors are similar in their construction to generators and could somehow be described as generators that work the other way around. When the current passes through the armature of a DC motor, a couple of forces are generated by the magnetic reaction, and the armature rotates. The action of the commutator and the motor field coil connections are precisely the same as the generators use. The voltage is opposite timken 471341 in the direction of the external voltage that applies to the armature, and hence it is known as induced voltage or counter-electromotive force.
When the motor rotates faster, the induced voltage increases until it is almost equal to that applied. The current is then small, and the motor speed will remain constant whenever the motor is not at low load and has to perform other mechanical work than is requested to move the armature. When at low load, the armature rotates more slowly, reducing the induced voltage and allowing a larger current to flow in the armature. The motor can thus receive more electrical power from the source, providing and doing more mechanical work.