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Homework Help: Equivalent resistance of a circuit

  1. Feb 15, 2009 #1
    1. The problem statement

    http://s685.photobucket.com/albums/vv212/dewdr0p714/?action=view&current=3circuitontakehometest1.jpg

    The voltage is on the left (100V) and the jagged lines are the resistors in Ohms. I need to find the equivalent resistance of the circuit and after that the current flowing through the 4 ohm resistor.

    2. Relevant equations

    I = V/R


    3. The attempt at a solution

    I'm not sure if I calculated these correctly...

    Equiv Resistance = 7 + (10/2) + 8 + (4/2) + 3 = 25 Ohms.

    For the current flowing through the 8 ohm resistor, I = V/R = 100V/25ohms = 4 Amps
     
    Last edited: Feb 16, 2009
  2. jcsd
  3. Feb 16, 2009 #2

    tiny-tim

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    Homework Helper

    Welcome to PF!

    Hi dewdrop714! Welcome to PF! :smile:
    Looks good! :biggrin:
    8 ohm? :confused:

    Anyway, that's the current through the whole circuit … you need the current flowing through just the bit of wire containing the 4(?) ohm resistor. :wink:
     
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