Finding expression for current through resistor

Discussion in 'Homework Help' started by boks, Dec 17, 2008.

  1. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
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    [​IMG]

    I want to find an expression for I_5.

    I see that I_{S1} = I_4 - I_5, but how can I proceed from here?
     
    Last edited: Dec 17, 2008
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Find the Norton equivalent circuit for the terminal across R5 and then calculate I5.
     
  3. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    I think I figured it out:

    I_{S1}=I_4 - I_5

    and -I_5 (R_1 + R_5) = I_4 R_4

    Solving for I_5 gives

    I_5 = \frac{-I_{S1} R_4}{R_4 + R_5 + R_1}
     
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