The Role of Batteries in Electrical Circuits

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Discussion Overview

The discussion revolves around the role of batteries in electrical circuits, focusing on the nature of energy provided by batteries, their analogy to pumps, and the movement of charge within the circuit. Participants explore theoretical concepts, analogies, and the implications of these ideas on understanding electrical circuits.

Discussion Character

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

Main Points Raised

  • One participant compares a battery to a pump, questioning whether the energy in a circuit is derived from the battery's chemical/electrical energy or if it merely provides the emf that drives charge movement.
  • Another participant suggests that the battery should be likened to a static energy accumulator, while an electric generator is more akin to a pump providing kinetic energy.
  • There is a query about whether the battery introduces energy into the circuit or simply pushes electrons through it.
  • One participant discusses the differences between incompressible fluids (like water) and compressible fluids (like air) in the context of energy transfer, relating this to the behavior of electrons in a circuit.
  • Another participant raises a question about the nature of electrical energy generated by the battery, asking if it contributes to the flow of electricity beyond just providing a push.
  • A later reply explains the flow of electrons and the concept of electric current, noting that while conventional current is said to flow from positive to negative, electrons actually move from negative to positive.

Areas of Agreement / Disagreement

Participants express differing views on the role of batteries in circuits, with no consensus reached on whether batteries provide energy or merely facilitate the movement of charge. The discussion remains unresolved regarding the implications of these analogies and concepts.

Contextual Notes

Participants rely on various analogies (e.g., hydronic systems, pumps, balloons) to explain complex concepts, which may introduce limitations based on the accuracy and applicability of these comparisons. The discussion also highlights the complexity of understanding charge movement and energy transfer in circuits.

raddy59
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I have a physics book that describes a battery in a circuit as like a pump that provided energy to the charge (e.g. a 1.5 volt battery gives 1.5 joules of energy to each coulomb of charge).

Am I right in assuming that the energy in a circuit is directly derived from the chemical/electrical energy generated by the battery?, Or does the battery provide the difference in emf that drives the movement of the charge?

maybe the "pump" analogy is giving me a wrong idea?

Just need to clear this up in my head 'cos I can't move on until I do
 
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Electric circuits and their elements , and units are sometimes compared to hydronic systems. EMF = pressure, capacitor = membrane, ampere = l/sec etc The pump that provide kinetic energy, would be better compared to an electric generator. The battery, a static energy accumulator, would be better compared to an inflated air ballon.
 
Yuri

The battery - does it provide the power, or does it push the electrons through/around the circuit to operate the lights/heaters etc?

Hydronic e.g. - would the "batter", does it introduce water into the system or just push the water impulse)?
 
Because pressurised water cannot carry much energy (being incompressible), but air can (compressible), I take as example the inflated ballon. But both water and air behave as fluids - as well as electrons.
Emf is force (either in the generator, and in the battery) that forces electrons to move in a conductor. Pressure (either in the pump, and in the ballon) forces molecules to move in a pipe /duct.
 
Yuri

So the electrical energy generated in the battery - does it bring anything to the mix, or just provide impulse. Does it add to the flow of electricity through the circuit apart from a push?

Another point - is it true that the direction of electrons is opposite to the direction of the charge?

Thanks for your replies
 
The charge "pushes" and keeps going the flow of electrons as soon as there appears a circuit between the poles, and the more is the charge, the more electrons get involved in this process, named "electric current".

Electrons jump from the orbit of one atom to the orbit (the "hole") of a neigbouring atom. Electrons carry the negative charge, the holes carry the positive charge. It is used to say that the current moves from plus to minus, but actually, the electrons are swapping atomic orbits from minus to plus (it is the "holes" that keep moving from plus to minus)

I am afraid, however, nobody will ever see an electron - the idea of electric current is a (most) plosible one among the probably many others.
 

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