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Homework Help: Current in a resistor and potential difference

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data
    In the circuit of figure p28.23, determine the current in each resistor and the potential difference across the 200 ohms resistor.


    2. Relevant equations

    1/Req= 1/R1+1/R2+1/R3+1/R4
    deltaV= IR
    3. The attempt at a solution

    Req=1/(1/200ohms +1/80ohms+ 1/20ohms+ 1/70ohms)= 12.22 ohms

    I=-240V/12.22ohms= -19.6 A
    deltaV= (-19.6A)(12.22)= -239 V
    Am I doing this completely wrong? If so what do I need to do?
  2. jcsd
  3. Oct 18, 2009 #2


    User Avatar
    Homework Helper

    To solve this problem, you must know network theorems. Some of them are Kirchhoff law, source conversion method, etc.
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