Power (AC)

Discussion in 'Homework Help' started by cheyenne, Mar 17, 2008.

  1. cheyenne

    Thread Starter Active Member

    Dec 6, 2007
    48
    0
    My question is:

    A load absorbs 2kW of power with a power factor of 0.9 (lagging). Find the reactive power of this load and state whether the load is inductive or capacitive. Is anyone able to help me with this example.

    I know reactive power = I.V.(0.9)

    How do I find I and V? Please help me. Thanks
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    lagging PF means inductive load.
    KVA*pf = KW
    hence,
    KVA=KW/pf

    KW is active power given by I.V.(0.9) in Kilowatts
    KVA is total or apparent power in KiloVoltAmpere
    Reactive power is KVA^2 -KW^2.
     
  3. cheyenne

    Thread Starter Active Member

    Dec 6, 2007
    48
    0
    Thanks, I got the answer now. I now understand the power triangle.
     
  4. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    Also, leading Pf means capacitive load (just incase the next one has leading Pf;)).
     
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