Circuit Q Basics: Understand Electrical Circuits

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Homework Help Overview

The discussion revolves around understanding electrical circuits, specifically the behavior of resistors in series and parallel configurations. Participants are examining the implications of a short circuit in relation to a 6Ω resistor and how it affects current flow in the circuit.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are exploring the definitions of series and parallel resistors, questioning the impact of a short circuit on current distribution. There is a focus on understanding why the 6Ω resistor does not carry current when a 0Ω resistor is present.

Discussion Status

Some participants have provided insights into the behavior of current in the circuit, particularly regarding the path of least resistance. However, there is still confusion about the reasoning behind the current flow and the definitions being applied, indicating an ongoing exploration of the concepts.

Contextual Notes

Participants are encouraged to make an effort to answer questions before seeking help, which may influence the depth of responses and engagement in the discussion.

User1265
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Homework Statement
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Are the two resistors in series or Parallel? and why so?
Relevant Equations
V=IR
2019-10-07.png
 

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As per our Forum rules you must make an effort to answer the question before you can receive help. Tell us what you think.
 
Recall Kirchhoff's current law, the sum of currents flowing into a node is equal to the sum of currents flowing out of it. Two resistors are said to be in series if they are siege to the same current, otherwise they are parallel.
Your circuit is a bit special, however. The wire connecting the two poles of the ##6\,\Omega## resistor short-circuits it because it is considered to be a ##0\,\Omega## resistor, as a result of which we theoretically assume that all the current will pass through it and none will pass through the bottom resistor. You might ask why this is, and I'll answer : compute the equivalent resistance with ##R_1=6\,\Omega## and ##R_2=0\,\Omega## and you'll find it to be ##0\,\Omega##.
2019-10-07.png
 
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"compute the equivalent resistance with ##R_1=6\,\Omega## and ##R_2=0\,\Omega## and you'll find it to be ##0\,\Omega##."

Thank you! I forgot the zero resistance, but I don't understand the instructions quoted above, explaining as to why no current will pass though the 6 ohm resistor
 
kuruman said:
As per our Forum rules you must make an effort to answer the question before you can receive help. Tell us what you think.
I thought 6 ohm and 4 ohm were parallel since they shared the same two nodes, but I'm not sure if this is even the correct reason, as there is a battery between in the upper branch opposite the diagonal branch.
 
User1265 said:
I thought 6 ohm and 4 ohm were parallel since they shared the same two nodes, but I'm not sure if this is even the correct reason, as there is a battery between in the upper branch opposite the diagonal branch.
For future reference, something like this belongs in your original post under "Attempt at a solution".
User1265 said:
"compute the equivalent resistance with ##R_1=6\,\Omega## and ##R_2=0\,\Omega## and you'll find it to be ##0\,\Omega##."

Thank you! I forgot the zero resistance, but I don't understand the instructions quoted above, explaining as to why no current will pass though the 6 ohm resistor
The 6 ohm resistor is in parallel with the short (0 ohm resistor). When the current reaches the node, it will take the path of least resistance. In this case all the available current will go through the short.
 
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