For a given torque, reducing divertor resistance of a DC series motor
A. Decrease in speed demanding less armature current.
B. Decrease in speed but armature current remains the same.
C. Increase in speed but armature currnet remains the same.
D. Increase in speed demanding more armature current.
Answer: D
Share your understanding of this question with the correct explanation.
For a given torque, reducing the divertor resistance of a DC series motor will result in an increase in speed demanding more armature current.
In a DC series motor, the speed of the motor is inversely proportional to the armature current. When the divertor resistance is reduced, it creates a lower resistance path for the armature current to flow. This effectively reduces the overall resistance in the motor circuit, allowing more current to flow through the armature.
According to Ohm’s Law (V = I * R), if the resistance (R) decreases, and the voltage (V) remains constant, the current (I) will increase. In this case, the decrease in divertor resistance causes an increase in armature current, which in turn leads to an increase in the speed of the motor.
Therefore, the correct answer is D: Increase in speed demanding more armature current.