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Need Help! Urgent! Circuits

Discussion in 'Homework Help' started by smarch, Apr 27, 2010.

  1. smarch

    Thread Starter Active Member

    Mar 14, 2009
    Hi everyone,
    I'm really terrible at RLC circuits etc, these are two problems I'm having trouble with. I have attached schematics of them.

    The first circuit, it says use thevenins theorem, determine the I in the 15
    Ω resistor and the voltage Vab of the AC circuit. I know I am meant to use a delta star transformation to determine the thevenin impedance, but I just don't know where to start!

    The second circuit says to use norotns theorem to determine the current in the 15
    Ω resistor of the AC circuit. Again I don't know why but when it comes to using capacitors and angles etc in circuits, i get confused!

    Please someone help, a step by step guide to solving these circuits?

    Last edited: Jun 23, 2010
  2. kingdano

    Senior Member

    Apr 14, 2010
  3. retched

    AAC Fanatic!

    Dec 5, 2009
    I thought classes WERE step-by-step guides to solving these problems?

    Oh, school kids.

    Where are you having the trouble?

    What have you done so far?