Understanding Voltage Definition and KVL in Electrical Circuits

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Discussion Overview

The discussion revolves around the relationship between the definition of voltage and Kirchhoff's Voltage Law (KVL) in electrical circuits. Participants explore whether the definition of voltage would still hold if KVL were not true, delving into concepts of energy conservation within closed systems.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant argues that if KVL were not true, then the definition of voltage would not make sense, linking this to the law of energy conservation.
  • Another participant requests a clear statement of the definition of voltage to facilitate the discussion.
  • A participant provides a definition of voltage as the energy required to move 1 coulomb of charge from one node to another.
  • Concerns are raised about scenarios involving batteries and nodes being the same, questioning how these affect the definition of voltage and KVL.
  • A suggested pattern for structuring the argument includes defining voltage, stating KVL, and exploring the implications if KVL is incorrect.
  • One participant acknowledges the initial idea but emphasizes the need for clarity in the explanation.

Areas of Agreement / Disagreement

Participants express differing views on the implications of KVL's validity for the definition of voltage, indicating that multiple competing perspectives remain without a consensus.

Contextual Notes

The discussion highlights the need for clear definitions and statements of principles, as well as the potential complexities introduced by specific circuit elements like batteries.

Who May Find This Useful

This discussion may be useful for students studying electrical engineering or physics, particularly those interested in circuit theory and the foundational principles of voltage and energy conservation.

ckboii89
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Homework Statement


If KVL was not true, would our definition of Voltage still make sense? Clearly explain and prove your answer


Homework Equations


KVL definition
Voltage definition

The Attempt at a Solution


I said no, because if KVL were not true, then definition of voltage would not make sense. By the law of energy conservation, Energy input = energy output( i may be wrong? but intuitive to me, since a circuit is a closed system). Since voltage by definition is the energy required to move 1C of charge from 1 node to another. The sum of voltages in a closed system must equal 0, since a system cannot have excess energy, as it must be either used,stored or dissipated

Thoughts guys? Proff made this question, and I've never come across a theoretical question like this in a engineering course
 
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You need a statement of the definition of voltage.
 
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The definition my proff gave me is this: Voltage is the energy required to move 1c of charge from 1 node to another
 
Generally - one volt is the energy required to move 1 coulomb from one node to the next... what if there is a battery between the two nodes? What if the end node is the same as the start node?

The next step is a statement of what KVL says ... then you want to relate the two.
The KVL requires a specific property of the electric field - besides energy conservation - do you know what it is?

Anyway - the patter for these things is:
1. definition of voltage
2. statement of KVL
3. what does 2 say about 1.
4. if 2. is wrong, what does that say about 1.

For the record: you have the right idea - but you were instructed to be clear.
 

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