Capacitive Reactance

Discussion in 'Homework Help' started by navyman, Oct 4, 2006.

  1. navyman

    Thread Starter New Member

    Sep 26, 2006
    7
    0
    If the formula is 1/2PI F C Xc
    and I want to solve for C

    Xc=2.5k ohms
    F=10kHz

    C= 1/6.28x10Kx2.5k

    (at this point, should I convert the 10K to 10,000 and the 2.5k to 2500??)

    I saw the answer expressed in pico farads. (6370pf)

    I am not certain why the answer would be expressed in pico farads??
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    The formula for capacitive reactance is Xc = 1/2pi F C. Rearrange the equation to solve for C. Yes, you need to use 2500 & 10000 for Xc and F.

    We use picofarads (pF) because the old convention of micro-microfarads was awkward. You can also express in nanofarads, or fractional farads if you like lots of zeroes following the decimal point.
     
  3. navyman

    Thread Starter New Member

    Sep 26, 2006
    7
    0
    Thank You... Got it !!
     
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