what is a battery or electric cell? why it maintain potential difference in circuit , why not devolop p.d
Answers
Batteries and cells are an important invention that have made a lot of our everyday tasks and life much easier. They are practically used in most of the portable electronic devices that we use today. Besides, we can say that we cannot imagine a world without batteries and cells.
Having said that, a cell and battery is quite different from each other even though the terms are used interchangeably sometimes. A battery usually contains electrical energy which is pre supplied from a factory or a battery can be charged via an outlet. Whereas a cell consists of chemical energy source such as natural gas, diesel or propane where it converts these into electrical energy for power. So, in terms of how it is made and the functionalities there are few significant differences between cell and battery.
A battery maintains a nearly constant change in electric potential across its terminals. When a complete circuit is connected from one terminal to the other, there is an electric current. Of course this current isn't for "free". It takes energy to move this current through a circuit. Where does the energy come from? There is energy stored in the battery in the form of chemical potential energy.
Yes, it is true that a current can be described as moving electrical charges. However, it is not true that these charges are "stored in the battery". Let me give a simple analogy. If electric current is like water, then a battery is like a water pump. In the scene above, the guy describes the battery as if it were a water balloon shooting out water. That's not how it works.
Hope it helps you.