Electric potential & electric potential difference

                    ELECTRIC POTENTIAL 

-> electric potential :- we have seen that the flow of electric charges is necessary to obtain an electric current we have seen that the flow of electric charges is necessary to obtain an electric current 

-> To understand this we have to understand the concept of flow of water . 

-> this is the 1st situation , take two vessels with hole at side near bottom surface and put a pipe in that holes now let the valves(switches) off. And fill the water.

-> now on the valves you can see the flow of water is vessel A to B and after some time the equal water in both vessels.

-> This happens because of the pressure difference in vessels. 

-> In similar way if we if we produce electric difference , then the electric current can be obtained. This difference in electric potential is known as electric potential difference.

-> On bringing some electric charge near any other charge, an attractive or repulsive force exerts on it. Thus, the work is to be done against this force keeping a charge in equilibrium and to move another near or far from it. This work is stored in the form of potential energy. This work done on the charge is called as an electric potential. Electric potential is defined as under:

-> The work required to bring the unit positive charge from infinity to any point against the electric force is known as electric potential at that point."

-> Electric potential = work done (W)/ electric charge (Q)

-> Electric potential is represented in voltage in the memory of Italian Scientist Alexandro Volta. Its symbol is V.

-> V=W/Q

-> The SI unit of electric potential is joule/coulomb or volt (V).

-> Electric potential difference In practice, electric potential has no importance, but changes in electric potential are important which are defined as under: The electric potential difference between any two points A and B in an electric field means the work done to bring the unit positive charge from point A to B against the electrical force." 

-> Electric potential difference (V)= work to be done(W)/electric charge (Q)

-> V=W/Q

-> Unit: joule/coulomb= volt

-> Electric potential difference is measured by voltmeter.