Why Can't I Use Voltage Divider On This Question?

Discussion in 'Homework Help' started by Student01, Mar 6, 2010.

  1. Student01

    Thread Starter Active Member

    Apr 15, 2009
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    [Solved]

    I am attempting the following question:

    [​IMG]

    I first approached it by using a voltage divider around the left-most loop. ie

    v = 10/15 x 20 = 13.33V

    I looked at the answer in the back of the book (10V) and upon inspection, this seems to be correct, but why is it that the voltage divider approach didn't work?
     
    Last edited: Mar 6, 2010
  2. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    The voltage divider formula didn't work because you failed to reduce the circuit ... but you should have realized that when you stated
    The 10 ohm is in parallel with the series combination of the 4 and 6 ohm resistors.
     
    Last edited: Mar 6, 2010
  3. Student01

    Thread Starter Active Member

    Apr 15, 2009
    35
    0
    Thank you for your reply, JoeJester. I think the problem here was I was confusing two circuit analysis techniques in my head (KVL and Voltage Divider). I was trying to apply a voltage divider "around any closed circuit." :/
     
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