Recent content by Sarak

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    How much current does the motor draw?

    Oops, never mind. He meant take half of the back emf, not half the current.
  2. S

    How much current does the motor draw?

    Homework Statement The starter motor in an automobile has a resistance of 0.37 Ω in its armature windings. The motor operates on 12 V and has a back emf of 10 V when running at normal operating speed. A)How much current does the motor draw at its operating speed? B)How much current does...
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    Primary coil of an ideal transformer. I need an equation.

    Homework Statement The primary coil of an ideal transformer is connected to a 120-V source and draws 1.0 A. The secondary coil has 600 turns and supplies an output current of 5.0 A to run an electrical device. A) What is the voltage across the secondary coil? B) How many turns are in the...