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, Rf is 218 Ω. The resistance of the rotor, Rr, is 5.9 Ω. When the motor is running, the rotor develops an emf Ԑ. The motor draws a current of 4.82 A from the line Friction losses amount to 45.0 W. Compute (a) the field current; (b) the rotor current; (c) the emf Ԑ; (d) the rate of development of thermal energy in the field windings; (e) the rate of development of thermal energy in the rotor; (f) the power input to the motor; (g) the efficiency of the motor.
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