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ELECTRIC POTENTIAL
If two charged bodies are in contact, the charge starts flowing from one conductor to the other. The electric condition, that determines the flow of charge from one conductor to another in contact, is the electric potential.
When W joule of work is done in bringing the test charge Q coulomb from infinity to the point P then the electric potential V at the point P then, V= W/Q
The work needed to move a charge Q from infinity to a point P where the electric potential is V will be W=QV
The S.I unit of work is joule and that of the charge is coulomb.
POTENTIAL DIFFERENCE
As current flows between two points A and B of an electric circuit, we just consider the charge between the points A and B, so knowing the exact potential at - point A and B is not important. Knowing the potential difference between points A and B is sufficient.Therefore the potential difference between the two points is equal to the work done in moving a unit positive charge from one point to the other.
The potential difference is expressed in volt (V). The potential difference between the two points is said to be 1 volt if the work is done in moving 1-coulomb charge from one point to another is 1 joule.
The Instrument used for measuring potential difference is a voltmeter.
www.toppr.com/guides/physics/electricity/electric-potential-and-potential-difference/
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