The direction of rotation of a dc series motor or a universal motor connected to a dc power source A) depends on the polarities
of the armature and field currents. B) depends exclusively on the polarity of the armature current. C) depends exclusively on the polarity of the field current. D) depends on the connection of the compensating winding.
<em>A) depends on the polarities of the armature and field currents.</em>
Explanation:
In the DC series motor, or a universal motor, the field and armature winding are connected in series. This means that if the polarity of the input DC voltage is changed, the direction of the field & armature will also change, resulting in the change of direction of rotation of the motor. This means that the direction of rotation of a DC series motor, or a universal motor connected to a DC power source can be reversed by changing the polarity of the field current, or the armature current.
