(a) Find the current in the coils when themotor is first turned on. 1 A (b) Find

Question

(a) Find the current in the coils when themotor is first turned on.
1 A
(b) Find the current in the coils when the motor has reachedmaximum speed.
2 A
(c) If the current in the motor were 4.0 Aat some instant, what is the back emf at that time?
3 V A motor has coils with a resistance of 25 and operates from a voltageof 237 V. When the motor is operating atits maximum speed, the back emf is 145 V. (a) Find the current in the coils when themotor is first turned on. 1 A (b) Find the current in the coils when the motor has reachedmaximum speed. 2 A (c) If the current in the motor were 4.0 Aat some instant, what is the back emf at that time? 3 V

Explanation / Answer

(a)
   the current will be
   I = / R
     = 237 V / 25
     = ........ amps
(b)
   at the maximum speed back = 145 V
   in this case the current will be
    I = ( - back) /R
      = ......... amps
(c)
   in this case
   back = - I R
           = 237 V - (4.0 amps) (25 )
           = ........ V

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