Charging a capacitor with a battery

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Discussion Overview

The discussion revolves around the process of charging a capacitor using a battery, focusing on the mechanisms of charge flow and potential differences. Participants explore the conceptual understanding of how charges move between the battery and capacitor plates, as well as the implications of potential assignments in the circuit.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether the negative terminal of the battery "sucks" charges or if charges flow due to induction from the positive terminal's influence on the capacitor plates.
  • Another participant draws an analogy with a vacuum cleaner to illustrate the nature of pressure differences versus charge flow.
  • There is a discussion about whether the plate connected to the positive terminal can induce a higher potential on the opposite plate, which is charged negatively, leading to confusion about potential assignments.
  • Some participants assert that conventional charge flows from the positive plate to the negative terminal, while noting that the negative terminal's potential is not necessarily zero, as zero potential is considered arbitrary.
  • One participant suggests that a clearer understanding of potential could be achieved by assigning zero potential at different points in the circuit, rather than defaulting to the negative terminal.

Areas of Agreement / Disagreement

Participants express differing views on the nature of charge flow and potential assignments, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations in the assumptions made about potential assignments and the definitions of charge flow, which remain unresolved in the discussion.

physics user1
How does it work? I mean I know all the stuff, there is difference in potential and the charges flows, my question is, does the negative terminal of the batteries suck charges or the charges flowing to the negative terminal are flowing because they are pushed by the charges induced on the plate by the other plate connected to the positive terminal? How does charging really work? If it doesn't suck the charges then we should be able to charge a capacitor by just connecting a plate to the positive terminal and the other to the ground, is that right?
 
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Does your vacuum cleaner suck or does atmospheric pressure blow into the nozzle because less air than normal is present?
 
jbriggs444 said:
Does your vacuum cleaner suck or does atmospheric pressure blow into the nozzle because less air than normal is present?

The last
 
Cozma Alex said:
The last
What difference does it make, if any?
 
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jbriggs444 said:
What difference does it make, if any?
None, So... the plate connected to the positive terminal charges, it induce an opposite charge on the other plate that now is at higher potential, and then charges flows from here to the negative terminal that is athe 0 potential, is that right? Cos that my analysis of the phenomenon using what you are suggesting, and how can the second plate be at higher potential f it is charged negatively? Actually the potential of it is lower than 0, but i know that charges flows from the plate to the negative terminal, why?
 
Cozma Alex said:
None, So... the plate connected to the positive terminal charges, it induce an opposite charge on the other plate that now is at higher potential,
The positive plate (the one connected to the positive terminal) now is at a higher potential then the negative plate (the one connected to the negative terminal). Conventional charge has flowed onto the positive plate and off of the negative plate.

and then charges flows from here to the negative terminal that is athe 0 potential, is that right?
The battery forces conventional charge to move against the direction of the potential difference -- from positive to negative, yes.

But the negative terminal is not necessarily at zero potential. Zero potential is arbitrary.

Cos that my analysis of the phenomenon using what you are suggesting, and how can the second plate be at higher potential f it is charged negatively?
It can't and it won't.
Actually the potential of it is lower than 0
What makes you say this?

Possibly you need to step back and assign a potential to all points in the circuit before you make the connections between battery and capacitor. Then run through what you think happens. Rather than put the zero potential at the negative terminal, why not put zero potential at the mid-point of the battery?
 
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