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Homework Help: Calculating the armature current of the motor.

  1. Aug 15, 2011 #1
    1. The problem statement, all variables and given/known data

    A single-phase, full-wave controlled bridge rectifier supplies a permanent magnet dc motor. The rectifier is connected to a 240V ac voltage source and absorbs 1200W of active power and 1000VAR of reactive power from the source. If power loss in the rectifier is negligible, calculate the armature current of the motor.

    2. Relevant equations
    calculate the armature current of the motor.

    3. The attempt at a solution

    I dont know where to start.. any tips would be appreciated..
  2. jcsd
  3. Aug 17, 2011 #2


    User Avatar

    Staff: Mentor

    Active (or real) power can be thought of as a vector at right angles to reactive power.

    Magnitude of power is voltage x current
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