Finding Potential Difference between two points

  • Thread starter Knah
  • Start date
  • #1
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Homework Statement


photo.JPG


Homework Equations


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

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.
 

Answers and Replies

  • #2
mukundpa
Homework Helper
524
3
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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