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Finding expresion for current through resistor

  1. Dec 17, 2008 #1

    I want to find an expression for [tex]I_5[/tex].

    I see that [tex]I_{S1} = I_4 - I_5[/tex], but how can I proceed from here?
  2. jcsd
  3. Dec 17, 2008 #2
    What other info were you given for the problem? What are the resistances, etc.?

    Just use Kirchoff's voltage and current laws.
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