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Finding Potential Difference between two points

  1. Apr 19, 2015 #1
    1. The problem statement, all variables and given/known data
    photo.JPG

    2. Relevant equations
    V=IR (Voltage = Current x Resistance)
    Possibly Kirchoff's Loop Rule but I'm not really sure how to use it

    3. The attempt at a solution

    I looked at something else on line and ended up doing 9 - 0.7(3) - 6 - 2(3) which got me the right answer for the first part but I don't really what I did and if that is the proper way to solve the problem so any explanation/correction for that would be great. For the second part, I had no idea.
     
  2. jcsd
  3. Apr 19, 2015 #2

    mukundpa

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    Homework Helper

    Hi,
    Need not to complete the loop, As we know the current in the branch start from point B (considering VB = 0 and move towards A and see the voltage is dropped or gained and add accordingly. As the current is to the right the voltage will increased on the left side of R (= IR) and then decrease due to cell by by 9 V and so on.
     
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