Technician A says the motor turns faster if there are more armature windings connected between the common and high-speed brushes. Technician B says the less counterelectromotive force (CEMF) in the armature, the greater the armature current. Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because less counterelectromotive force (CEMF) in the armature does indeed result in greater armature current, as CEMF opposes the applied voltage, reducing the net voltage and thus the current when it is higher. Technician A's statement is incorrect; more windings between the common and high-speed brushes would increase resistance, not necessarily increase speed.

Technician a Says the Motor Turns Faster If There Are