A DC Motor

A shunt-wound DC motor with the field coils and rotor connected in parallel operates from a 120 V DC power line. The resistance of the field windings,RT, is 228 OHMS .The resistance of the rotor, , is 4.30 OHMS . When the motor is running, the rotor develops an emf . The motor draws a current of 4.56 A from the line. Friction lossesamount to 47.0 W . A)Compute the field current. B)Compute the rotor current C)Compute the emf D) Compute the rate of development of thermal energy in the fieldwindings. Express answer in watts. E)Compute the power input to the motor F)Compute the efficiency of the motor.


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