Calculating potential difference

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Homework Help Overview

The discussion revolves around calculating the potential difference in a circuit with two resistors in series, specifically focusing on the voltage between two points in the circuit. The circuit is described as having a total voltage of 50 V, with resistances of 400 Ohms and 600 Ohms.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore why the potential difference is not equal to the total voltage of 50 V, questioning the reasoning behind the expected answer of 30 V. There is a discussion about whether the resistors are in series or parallel.

Discussion Status

Some participants have provided insights that clarify the relationship between the total voltage and the voltage across individual resistors. However, there remains a lack of explicit consensus on the reasoning behind the potential difference calculation.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information available for discussion. The original poster's confusion about the potential difference suggests a need for further clarification on series circuits and voltage division.

tmusgrove
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Homework Statement



In a 50 V circuit with a 400 Ohm resistance and a 600 Ohm resistance in series; Point A is between the two resistors and point B is to the right of the 600 Ohm resistor. Charge is moving from right to left.

Homework Equations



V=IR

The Attempt at a Solution


The answer is supposed to be 30 V, but why isn't it 50 V?
 
Last edited:
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In parallel? It seems, from the rest of the question and the answer, like they're in series.
 
Hi tmusgrove! :smile:
tmusgrove said:
In a 50 V circuit with a 400 Ohm resistance and a 600 Ohm resistance in series; Point A is between the two resistors and point B is to the right of the 600 Ohm resistor. Charge is moving from right to left.

The answer is supposed to be 30 V, but why isn't it 50 V?

How can it be 50 V ?

That's the potential difference across both resistors. :wink:
 
With TinyTim's reminder that the whole potential difference was 50, I could solve the problem. 600 Ohms and 400 Ohms = 1000 Ohms. 600 is 3/5 of 1000. 3/5 of 50 = 30. So, the answer is 30 V.
 
Yup! :biggrin:
 

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