RCL-parallel, I know current's but how to calculate Z?

Discussion in 'Homework Help' started by Jeo, Dec 8, 2006.

  1. Jeo

    Thread Starter New Member

    Nov 26, 2006
    2
    0
    Hi!
    I got RCL-parallel, I know current I (for Z), Ir, Ic and Il, so how can I calculate the Z from these informations? (I know voltage source value 10V , R 500 ohm ,L 2,5 mH and C 0,7 uF but it was mentioned that calculate Z with only using currents).

    Jeo
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,905
    1,723
    Ohm's law my friend
    Code ( (Unknown Language)):
    1.  
    2. if V = I * Z then
    3.  
    4. Z = V / I
    5.  
    That's not acting...It's ALGEBRA!
    To compute the branch impedances you don't need the inductance or capacitance values.
    To compute the reactances you also need to know the frequency.
     
  3. Jeo

    Thread Starter New Member

    Nov 26, 2006
    2
    0
    I know that E=IZ but if I need to calculate Z only using branch currents (I know frequency)? Any ideas? There is something about "I is equal to Z and Ic equal to Xc".. Meaby I cheat and use ohm's law..
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    143
    Do you know the currents in polar form? (i.e. complex form) then you can use this tutorial to deduce Z for the parallel arrangement.

    Dave
     
  5. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,277
    1,067
    Well, don't keep us in suspense. Tell us the frequency you used and then show your answers and the work.
     
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