Recharging batteries. Recharging Electronic Device Batteries

There are several equipments that need electrical energy to work. Some of them need the battery to be changed, others have cells or batteries that are rechargeable. An example of the use of a rechargeable battery is the automobile, because when we start the engine, the battery in it provides the energy necessary to activate the starter motor.
We can say that this process occurs because the electrical energy that drives the starter nothing it is more than the energy that is stored in chemical bonds and turned into energy electrical. After the engine starts running, another device called an alternator (or dynamo) starts to work, charging the car's battery.

Current enters through the positive pole of the battery
Current enters through the positive pole of the battery

We can see in the figure above that instead of the electric current leaving the positive terminal of the battery, it enters through the positive pole. Thus, the chemical reactions occur in the opposite direction to that verified in the phase in which the battery was activating the starter.


We see that in this process the battery receives electrical energy, which is stored in chemical bonds, and does not supply electrical energy to the circuit. So we say that the car battery works as a receiver and not a generator while the car is running.
We can find this same process with cordless phones as well as cell phone batteries. Because when we are using these types of phones their batteries work as generators, as the current leaves the positive pole. But when their batteries run out, or better, run out, they are placed in appliances connected to electricity to be charged.
In this phase, they do not function as generators, but as receivers: current enters through the positive pole. There are batteries that cannot be recharged, as chemical reactions cannot take place in reverse. Rechargeable batteries are also called reversible generators.
When a reversible generator acts as a receiver, its electromotive force (E) is often called the force. electromotive, which is abbreviated by f.c.e.m. An electric motor receiving power from a generator is also a receiver.

Do not stop now... There's more after the advertising ;)

By Domitiano Marques
Graduated in Physics
Brazil School Team

Would you like to reference this text in a school or academic work? Look:

SILVA, Domitiano Correa Marques da. "Recharging batteries"; Brazil School. Available in: https://brasilescola.uol.com.br/fisica/recarregando-baterias.htm. Accessed on July 27, 2021.

Performance of thermal machines

Performance of thermal machines

Thermal machines are devices that convert partially thermal and chemical energy contained in its ...

read more

The Study of Fusion

The phenomenon of fusion occurs when a substance receives heat from a source.A substance is said ...

read more
Influence of Pressure on Phase Change. Pressure and phase change

Influence of Pressure on Phase Change. Pressure and phase change

Experimentally, it is observed that the change in pressure exerted on a substance implies a chang...

read more