Calculating Potential Difference in Parallel Circuits

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Homework Help Overview

The discussion revolves around calculating the potential difference in a parallel circuit, specifically focusing on points AB and BC. Participants are analyzing the relationships between resistances and currents in the circuit setup.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the potential difference using a formula based on resistance ratios. Some participants suggest using equivalent resistances to simplify the problem. Others question the understanding of total resistance in parallel connections.

Discussion Status

The discussion is ongoing, with participants exploring different methods to approach the problem. Some guidance has been offered regarding the calculation of total resistance, but there is no explicit consensus on the correct approach yet.

Contextual Notes

Participants are navigating through the definitions and formulas related to resistances in parallel circuits, indicating some confusion about the correct application of these concepts.

looi76
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Homework Statement


http://img241.imageshack.us/img241/1087/09052008hf9.png
What is the potential difference across (i) AB (ii) BC.

Homework Equations


??

The Attempt at a Solution


(i) [tex]\frac{200}{400} \times 6 = 3V[/tex]

Is this right? :confused:
 
Last edited by a moderator:
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I think the easiest way to do this would be to use equivalent resistances to find the current. After that it is very easy
 
I didn't understand...
 
Hi looi76,

We know the total resistance between A and B is 200 ohms. What is the total resistance between B and C?
 
The total resistance between B and C is 100 because they are connected in parallel. So, [tex]\frac{200}{(100 + 200)} \times 3 = 2V[/tex]

Is this correct?
 
No, that is not the total resistance between B and C. They are both in parallel. What is the formula for resistance connected in parallel?
 

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