A motor with a coil resistance of 12 Ω is attached to a voltage supply of 75 V.What is the current in the motor when it is running at its maximum speed with a back emf of 25 V?
A) zero
B) 4.2 A
C) 8.3 A
D) 6.3 A
E) 600 A

Question

A motor with a coil resistance of 12 Ω is attached to a voltage supply of 75 V.What is the current in the motor when it is running at its maximum speed with a back emf of 25 V?
A) zero
B) 4.2 A
C) 8.3 A
D) 6.3 A
E) ​600 A

Quizplus · Accepted Answer

Ohm's law: I = V / RI = (75 V - 25 V) / 12 ΩI = 4.2 A

A Motor with a Coil Resistance of 12 Ω Is