problem about Sinusoidal Circuits ..

Discussion in 'Homework Help' started by Brawny, Jan 8, 2011.

  1. Brawny

    Thread Starter New Member

    Jan 8, 2011
    1
    0
    hey there
    i have this problem :

    A group of small appliances on a 60 Hz system requires 20kVA at 0.85 pf
    lagging when operated at 120V (rms). The impedance of the feeder
    supplying the appliances is 0.01 + j0.08Ω. The voltage at the load end of
    the feeder is 120 V.
    1. What is the rms magnitude of the voltage at the source end of the feeder?
    2. What is the average power loss in the feeder?
    3. What size capacitor (in microfarads) at the load end of the feeder is
    needed to improve the load power factor to unity?
    4. After the capacitor is installed, what is the rms magnitude of the voltage
    at the source end of the feeder if the load voltage is maintainedDW V?
    5. What is the average power loss in the feeder for part d ?

    well ,
    P = S cos@
    S = V rms * I rms
    S is already given
    so i can get the power across the feeder
    inform me if im wrong
    the rest i would someone helps me
     
    Last edited: Jan 8, 2011
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