What is the difference between Electric Potential and Potential Difference ?

Asked by Shaily Bhatt | 4th May, 2014, 10:29: PM

Expert Answer:

The electric potential is the electrical state of a conductor which determines the direction of flow of charge when the two conductors are either kept in contact or joined by a metalic wire.
 
Potential at a point can be defined as the amount of work done in bringing a unit positive charge from infinity to that point. It is a scalar quantity.
Electric potential  V equals W over Q where W joule of work is done in bringing the test charge Q coloumb from infinity to that point. Unit of electric potential is Volt.
 
In practice while considering the flow of  current in a conductor we consider the flow of charge between two points so its essential to know the potential at each points. And we consider the potential difference between those two points.
 
The potential difference between two points is equal to the work done in moving a unit positive charge from one point to the other.
Potential difference between two points A and B is given by
V subscript A minus V subscript B equals W over Q
if W joule is the work done in moving a test charge Q coloumb from a point A to point B.

Answered by  | 5th May, 2014, 08:53: AM

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