problem 2 on superposition

Discussion in 'Homework Help' started by electronicstech07, Nov 2, 2008.

  1. electronicstech07

    Thread Starter Member

    Nov 16, 2007
    18
    0
    I have attached my work on another problem involving superposition. It involves a Is and Vs and is asking me to find Ir3. Help is much appreciated!
     
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  2. vvkannan

    Active Member

    Aug 9, 2008
    138
    11
    While calculating I (killing Vs) entering at B the resistance in the denominator should be the sum of total resistance.I think you have made a mistake there.
     
  3. electronicstech07

    Thread Starter Member

    Nov 16, 2007
    18
    0
    You're correct again. I guess I'm going a little too fast calculating the answer on some of these problems. Thanks again!
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    What is the answer given in the book?

    hgmjr
     
  5. electronicstech07

    Thread Starter Member

    Nov 16, 2007
    18
    0
    The answer is 1.6 mA and that is what I got when correcting the value of the denominator to 852.5 ohms when calculating for I entering pt. B.

    I entering pt. B = 680/852.5 * 100 mA = 79.76 mA.

    Using I divider, Ir3 = 220/1020 ohms * 79.76 mA = 17.2 mA

    Solving for Ir3, 17.2-15.6 = 1.60 mA.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Here is the Millman's Theorem approach to the problem.
     
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