Finding Potential Difference between two points

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SUMMARY

The discussion focuses on calculating the potential difference between two points using Ohm's Law (V=IR) and Kirchhoff's Loop Rule. A participant successfully derived a voltage value by applying the equation 9 - 0.7(3) - 6 - 2(3), confirming its correctness for the first part of the problem. However, they expressed uncertainty about their method and the second part of the question. Another contributor clarified that it is unnecessary to complete the loop and explained how to analyze voltage changes based on current direction and resistance values.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Familiarity with Kirchhoff's Loop Rule
  • Basic knowledge of electrical circuits
  • Ability to analyze voltage drops and gains in a circuit
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  • Practice solving circuit problems using Ohm's Law
  • Explore advanced circuit analysis techniques
  • Learn about series and parallel circuits and their voltage characteristics
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Homework Statement


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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.
 
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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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