Purpose of batteries and dynamos

  • Thread starter Mr_Bojingles
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In summary, batteries and power supplies in electrical circuits do not create charge, but rather convert and move existing charges. A battery has a positive and negative charge, and when a conductor comes in contact, a current flows. The battery serves to create a potential difference in the conductor, causing the current to flow. As the charges flow through the circuit, they eventually return to the battery. Electrons lose energy as they pass through a resistor, and gain energy as they pass through a power supply. Electrons are the only charges that flow through the circuit, not protons. Conductors conduct electricity because their outer electrons have a weak attraction to their protons, and the flow of electricity occurs as the conductors try to reach equilibrium.
  • #1
Mr_Bojingles
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Is the purpose of batteries and power supplies in an electrical circuit only to pump the charge that already exists in the metal conductor wire or do batteries and dynamos etc. actually create charge then pump it into the conductor wire?
 
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  • #2
A battery possesses a positive charge, voltage, which is an excess of protons, and a negative charge, which is an excess of electrons. When a conductor comes in contact with the positive and negative charged bodies, there shall be a current flow, or a flow of electrons to the positive charged body to fill the lack of electrons. Thus, obeying the law "Like charges repel, and unlike charges attract."
 
  • #3
We have no devices capable of CREATING charge. We can only move charges.

The chemical reaction in battery release electrons which have energy with respect to the positive terminal. This is the source of the current which does work for us.

A power supply converts power (charge if you will) to a form useful in electronic devices.

It is all about conversion, not creation.
 
  • #4
Ah that makes sense. I was under the impression that batteries supplied the conductors with electrons freed from the electrodes by the redox reaction within the cell. So the battery serves only to create a potential difference at a certain point in the conductor wire which causes a current to flow.
 
  • #5
When the charges flow all the way around the circuit starting from the anode and eventually reach the cathode of the battery again are they sucked into the battery or do they jump straight from the cathode to the anode or what?

Also I was wondering what exactly happens to the electrons after they pass through a charge consumer such a light bulb filament. Do they just continue on theyre way around the circuit back towards the cathode? I read somewhere that they lose energy when they pass through the resistor and they gain energy when they pass through the power supply. How is this possible? I thought electrons all have an equal charge. How can the energy of one free electron differ from another?

Sorry for asking so many different questions but there's another thing confusing me. Is it only electrons that flow through the circuit or do the protons flow aswell?
 
  • #6
protons don't from move the nucleus, only electrons do and then it's only a few from the outer layer that are have the weakest attraction to their protons. copper electrons in the outer shell have a weak attaction, while rubber ones don't that what makes a conductor conduct electricity. the reason electricity "flows" is because all of the conductors are trying to get back lost or get rid of extra electrons so they can be in a state of equilibrium. this is also how atoms bond to form molecules (chains of atoms) like air.
 

What is the purpose of batteries and dynamos?

Batteries and dynamos serve as sources of electrical energy that can be used to power various devices and machines.

How do batteries and dynamos work?

Batteries use chemical reactions to convert stored chemical energy into electrical energy, while dynamos use electromagnetic induction to convert mechanical energy into electrical energy.

What are the differences between batteries and dynamos?

The main difference between batteries and dynamos is their source of energy conversion. Batteries use chemical reactions, while dynamos use mechanical energy. Additionally, batteries store energy, while dynamos generate energy continuously.

What are some common uses of batteries and dynamos?

Batteries are commonly used in portable electronic devices such as cell phones, laptops, and remote controls. Dynamos are often used in larger machines such as generators and power plants.

What are the environmental impacts of batteries and dynamos?

Both batteries and dynamos can have negative environmental impacts if not disposed of properly. Batteries contain harmful chemicals that can leak into the environment, while dynamos can produce greenhouse gases and contribute to air pollution if powered by fossil fuels. It is important to recycle and properly dispose of batteries and use renewable sources of energy to power dynamos.

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