Voltage Equality: How to Determine Between Two Points with Resistances Given

  • Context: Undergrad 
  • Thread starter Thread starter Aya Elsayed
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Discussion Overview

The discussion revolves around determining whether two points in a circuit have the same voltage, particularly in the context of resistances given in a circuit. It includes aspects of circuit analysis and the implications of voltage equality on resistance cancellation.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how to determine if the voltages of two points are equal, given the resistances in the circuit.
  • Another participant suggests analyzing the circuit to find the answer, but does not specify how.
  • A further reply challenges the broadness of the initial question, implying that more specific information is needed for a proper analysis.
  • One participant explains that if two points have the same voltage, the resistance between them can be ignored, referencing the Wheatstone bridge as an example where this principle applies.
  • A link to a tutorial article on Wheatstone Bridge circuits is provided, suggesting it may help clarify the operation and answer the initial question.
  • A final post indicates that the original poster has understood the information provided, but does not elaborate on what was learned.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the method for determining voltage equality, and multiple views on how to approach the analysis remain present throughout the discussion.

Contextual Notes

The discussion lacks specific details on the circuit configuration and does not resolve how to analyze the circuit effectively to determine voltage equality.

Aya Elsayed
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It's written in my book that if you have two points having the same voltage then you'll cancel the resistance between them ... how can I know if the voltages of the two points are equal ...( The resistances are given in the circuit .)
 
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Aya Elsayed said:
... how can I know if the voltages of the two points are equal
Analyze the circuit
 
phinds said:
Analyze the circuit
In which way?
 
Aya Elsayed said:
In which way?
Do you know ANYTHING about circuits? Your question is too broad to have an answer.
 
Aya Elsayed said:
if you have two points having the same voltage then you'll cancel the resistance between them
Cancel in that case means you can ignore any resistance between them.
Take a look at the diagram at the top of this page; https://en.wikipedia.org/wiki/Wheatstone_bridge
If the bridge is balanced, VG will be zero and the resistance of the meter VG will not have any effect on currents in the circuit. You can then join points D and B with an open or a short circuit without any change.
When balanced the ratio R1/R2 = R3/Rx.
 
Here is a short tutorial article about a Wheatstone Bridge circuit. It is sometimes used to measure resistor values. It's operation at least partly describes an answer to your question. Hope it helps. There are other tutorials on the same site that may interest you.

http://www.electronics-tutorials.ws/blog/wheatstone-bridge.html
 
Thank you all for help ..got it !
 

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