Use of Batteries

If we want to understand exactly the main use of battery we should ask a smart question, which is

why electrons don't move in conductive materials automatically?

if we imagine electronics as water molecules in a pipe, so if I don`t have pump or pressure in the pipe

*what will happen?

what will happen is that the water will stay in its place until we apply a pump that pushes this water

to move in one direction to make a closed loop that would be useful in many applications!

the same idea here on electronics and electricity!

the pump is the battery or the power source we have in our circuit these electrons have been pushed

from side to another just when we put the battery in our circuit just to push electrons from side to

another then we now have an electric current.

So batteries act as a power source and also a huge electronics source, batteries actually have a

positive side and negative side, the positive side have a little number of electrons while the negative

side has the most amount of negative electrons, according to the magnatic theory the opposite charges

attract, whereas particles with similar charges repel each other so all these negative electrons repel

each other just when you put them in a conductive wire causing an electric current.

[Summary] 

a group of electrons in a wire have a random movement,, when you connect the negative side in one

on its sides, the electrons will repel each other and it will be all in one direction then we have an

electric current.