Help needed on this QUESTION....!!!

Discussion in 'Homework Help' started by Ladies_Man, Jul 30, 2007.

  1. Ladies_Man

    Thread Starter New Member

    Jul 28, 2007
    4
    0
    A current of 1mA (rms) is flowing through a 0.00047microF capacitor.
    If the frequency of the applied voltage across the capacitor is 10kHz, calculate the (a) the voltage, (b) true power and (c) the reactive power of the capacitor....

    PLEASE HELP ME ON THIS....

    If u don't mind, show me all the steps in details...

    THANKS....
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    Please read.

    We can help, but we are not just going to give you the answer without any input on your part.

    This also looks like a homework question, therefore will be moved to the appropriate forum.

    Dave
     
  3. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    is that the complete data?
    to calculate active and reactive power u need the resistance offered to the current. if capacitor is an ideal one power is purely reactive.
    z= impedance ,
    v= voltage,
    i=current,
    r=resistance,
    Xc= capacitive reactance,
    z= sqrt(r^2 + Xc^2 )
    V=i*z.
    power (apparent) = V.I
    power (apparent)^2 = reactive power ^2 + active power^2
    (there are other ways to get it as well use impedance triangle and find power factor)
    reactive power= VIsin(phi)
    active power = VIcos(phi)
    active power = I^2.R
     
  4. Ladies_Man

    Thread Starter New Member

    Jul 28, 2007
    4
    0
    Well yeah.. basically that's the question...

    I'm not quite sure really...

    Cause i don't quite understand the question...

    BTW.. I'm sorry DAVE...
     
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