Voltage and the concept of work

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    Concept Voltage Work
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Discussion Overview

The discussion centers around the concept of voltage and its relationship to work done on electric charges, particularly in the context of batteries. Participants explore the mechanisms behind charge movement and the sources of work involved in this process.

Discussion Character

  • Conceptual clarification, Technical explanation, Debate/contested

Main Points Raised

  • One participant states that voltage is defined as the work done per unit of charge to move a charge within an electric field.
  • Another participant explains that to do work on a charge, it must be moved against an electric field, resulting in energy gain for the charge.
  • There is a discussion about the spontaneous movement of electrons from the negative terminal to the positive terminal in a battery, with a mention of ions inside the battery completing the circuit due to a chemical reaction.
  • A participant questions the source of work being done on the charge, seeking clarification on what causes this work.
  • One response attributes the source of work to the chemical potential energy of chemicals that are not at equilibrium and react when combined.

Areas of Agreement / Disagreement

Participants express varying degrees of understanding regarding the concept of work done on charges and the mechanisms involved, but there is no clear consensus on all aspects of the discussion.

Contextual Notes

Some assumptions about the nature of electric fields and chemical reactions are present, but these are not fully explored or resolved in the discussion.

user111_23
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Okay, I understand that voltage is the work done per unit of charge from the electric field to move a charge from one point to another.

What does it mean for work being done on a charge? Are the charges being moved by an electric field? If so, why would the electrons move towards the negative terminal in a battery? Why not the positive terminal? (Since + goes with -.)
 
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To do work on a charge, we have to move it in opposition to an electric field. We do work, the charge gains energy.

In the case of a battery, electrons in the external circuit move spontaneously from the negative terminal to the positive terminal. Ions inside the battery complete the circuit, driven by a chemical reaction that performs work on the ions.
 
Mapes said:
To do work on a charge, we have to move it in opposition to an electric field. We do work, the charge gains energy.

In the case of a battery, electrons in the external circuit move spontaneously from the negative terminal to the positive terminal. Ions inside the battery complete the circuit, driven by a chemical reaction that performs work on the ions.

I understand that. However, where is work coming from? What causing work to be done on the charge?
 
The work comes from the chemical potential energy of two or more chemicals that are not at equilibrium and react when placed together.
 
Mapes said:
The work comes from the chemical potential energy of two or more chemicals that are not at equilibrium and react when placed together.

Ah that makes sense. Thanks!
 

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