13.6 Exercise 7

A 120-V, series-wound motor has a field resistance of 80 $\Omega$ and an armature resistance of 10 $\Omega$. When it is operating at full speed, a back emf of 75 V is generated. (a) What is the initial current drawn by the motor? When the motor is operating at full speed, where are (b) the current drawn by the motor, (c) the power output of the source, (d) the power output of the motor, and (e) the power dissipated in the two resistances?