Check my understanding of electrical energy please.

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Discussion Overview

The discussion centers on the understanding of electrical potential energy, particularly in relation to moving charges and electromagnetic fields. Participants explore the nature of potential energy, its relationship to work done on charges, and the implications of electromagnetic fields in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant states that when work is done on a Coulomb of charge, it gains potential energy equal to the work done, suggesting that this energy manifests as an electromagnetic field when the charge is in motion.
  • Another participant simplifies this idea, proposing that electrical potential energy exists in the form of electromagnetic or electric fields.
  • A later reply highlights that frequency and resonance effects significantly influence the behavior of moving charges and electromagnetic radiation, indicating that the speed of charge movement affects energy changes and potential losses.
  • One participant questions the relationship between the potential energy of a charge and its electromagnetic field, asking how potential energy, defined as a scalar, can be "in the form of a field."
  • Another participant expresses confusion and suggests that potential energy and the electromagnetic fields of a charge may be unrelated, seeking clarification on the original question posed.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between potential energy and electromagnetic fields, with some questioning the connection and others proposing that they are related. The discussion remains unresolved, with no consensus reached on the nature of electrical potential energy in this context.

Contextual Notes

Participants note the importance of considering frequency and resonance effects when discussing moving charges and electromagnetic energy, indicating that the discussion may be limited by assumptions about these factors.

user111_23
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When work is done on a Coulomb of charge, it gains potential energy equal to the amount of work done on it. Now, since this charge is moving, it's electric field is changing. Because of that, a changing magnetic field surrounds a charge. Now, since this only happens when the Coulomb is moved by a voltage, the PE of the charge will be in the form of an electromagnetic field. This energy does work on devices when the fields set up voltage drops across them.

Any issues here?
 
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Simplified: My assumption is that electrical potential energy is in the form of EM or electric fields.
 
Wow, tough crowd. I guess I make really confusing topics.
 
user111_23 said:
Wow, tough crowd. I guess I make really confusing topics.

LOL. Well, at least for me, I didn't respond because you were neglecting frequency and resonance effects, which have a big influence on what happens with moving charges and EM radiation energy propagating away.

If you slowly move charge, you will get a change in energy that corresponds to the traditional DC energy equations (like energy stored on a cap). If you quickly move charges (with respect to the size of the conductors that you are moving them along), then you will get some EM losses.

Could you please be more specific about your question? Geometry, frequeency, etc.? Thanks.
 
Hi user111_23! :smile:

(btw, it's "coulomb", with a small "c", same as any other unit :wink:)
user111_23 said:
When work is done on a Coulomb of charge, it gains potential energy equal to the amount of work done on it. Now, since this charge is moving, it's electric field is changing. Because of that, a changing magnetic field surrounds a charge. Now, since this only happens when the Coulomb is moved by a voltage, the PE of the charge will be in the form of an electromagnetic field. This energy does work on devices when the fields set up voltage drops across them.

Any issues here?

PE is another name for work done by a conservative force.

A magnetic field surrounds a charge only if the charge is moving (relative to a particular observer).

The PE of the charge is the result of having moved through an external field.

What does the field of the charge itself have to do with it? And how can PE (a scalar) be "in the form of a field"? :confused:
 
berkeman said:
LOL. Well, at least for me, I didn't respond because you were neglecting frequency and resonance effects, which have a big influence on what happens with moving charges and EM radiation energy propagating away.

If you slowly move charge, you will get a change in energy that corresponds to the traditional DC energy equations (like energy stored on a cap). If you quickly move charges (with respect to the size of the conductors that you are moving them along), then you will get some EM losses.

Could you please be more specific about your question? Geometry, frequeency, etc.? Thanks.

I'm sort of a physics newb so bear with me. :-p

I learned that electrical energy is in the form of EM waves/fields. So I'm trying to see whether the PE supplied to a charge through voltage is also electromagnetic energy. Weird question, I know.
 
tiny-tim said:
Hi user111_23! :smile:

(btw, it's "coulomb", with a small "c", same as any other unit :wink:)PE is another name for work done by a conservative force.

A magnetic field surrounds a charge only if the charge is moving (relative to a particular observer).

The PE of the charge is the result of having moved through an external field.

What does the field of the charge itself have to do with it? And how can PE (a scalar) be "in the form of a field"? :confused:


yea that's what I'm thinking too, to me, PE and the EM fields of a charge is unrelated

user111_23 perhaps you could clarify the question a bit or give more detail on your hypothesis
 

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