Finding Potential Difference between two points

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To find the potential difference between two points, the voltage can be calculated using the formula V=IR, where I is the current and R is the resistance. The discussion highlights the use of Kirchhoff's Loop Rule for analyzing circuits, although its application may be unclear. One participant successfully calculated the potential difference using the equation 9 - 0.7(3) - 6 - 2(3) but seeks clarification on the method. It is emphasized that when analyzing the circuit, one should consider the direction of current flow and how it affects voltage changes across components. Understanding these principles is crucial for accurately solving circuit problems.
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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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