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PD between 2 points

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data
    a current of 2A is flowing from a to b.
    what is the potential difference between the points?

    ______a______3ohm_____-20V+_____1ohm_______+6V-________b_____


    hopefully my diagram makes sense.


    2. Relevant equations
    this is a really simple question and i cant answer it because im not understanding the whole concept.
    Does current (or anything) stay constant in a cicuit??
    do i follow the current round/thru circuit and do calcs along the way?
    so voltage after 3ohm-R = IR = 6V
    so 6V into 20V battery. now im stuck. it goes into neg term first so is that -20V?? please help somene! thanks


    3. The attempt at a solution
     
  2. jcsd
  3. Nov 9, 2007 #2

    rl.bhat

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    Homework Helper

    If you assume a battery of EMF E volt is connected across the a and b such that a end is +ve and b end is -ve. Apply loop law, and find E. If you get E +ve, signs of a and b correct. If you get E -ve, reverse the signs of a and b.
     
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