Potential Difference
Potential Difference
Electric Potential:
Electric potential at a point in electric field is defined to be equal to the minimum work done by an external agent in moving a unit positive charge from infinity or a reference point to that point against the electrical force of the field. If W is the work done by external agent in bringing a positive test charge qo from infinity to a point then the potential V at that point,
According to Newtons Third Law of motion i.e. for every action there is equal and opposite reaction
The work done by an external agent in bringing a positive test charge qo from infinity to a point will be equal and opposite ti the work done by the electric field on a positive test charge qo, if
The SI unit of electric potential is joule/coulomb or volt.
Potential Difference: Potential difference between two points is equal to the minimum work done in moving a unit positive test charge from one point to the other.
,
is the work done by the electric field then
Hence the work done by external agent
And Work done by the electric field is
We know that heat energy flows from the higher temperature to the lower temperature, and this process stops when the both are at the same temperature. Same is the case with electricity, when the ends of an electrical conductor are at different potentials or we can say that when there is a potential difference - charge in the conductor flow from the higher potential to the lower potential.The flow of charge persists until both ends reach the same potential. Without a potential difference, no flow of charge will take place.
Illustration: How much work is done in moving a charge of 2 C from a point of 118 V to a point at 128 V ?
Solution: Given, charge, q = 2 C
Potential at point A
and Potential at point B
Work done, W = ? We know that,
Potential difference,
Work Done,
So, the work done in moving the charge is 20 J.
A suitable unit for expressing electric field strength is __________________ | |||
| Right Option : D | |||
| View Explanation | |||
A particle a charge of 1.6 coulombs is taken from a point A at a potential of 50 V to another point B at a potential of 120 V.Calculate the work done. | |||
| Right Option : A | |||
| View Explanation | |||
Choose the correct statement. A In case of an electric cell chemical energy is converted into electrical energy. B The current flows when there is potential difference | |||
| Right Option : C | |||
| View Explanation | |||
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