Question

What is meant by saying that the potential difference
between two points is 5v?​

Answer 1

Explanation:

When 1 Joule of work is done to move a charge of amount 1 Coulomb from one place to another, then it is said that the potential difference between the two points is 1 Volt (V).

Answer 2

Potential Difference :

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When we consider the flow of current between two points A and B of electric current we considered only the flow of charge between the two points A and B therefore it is not necessary to know the extra potential at each point A and B . It is sufficient to know the potential difference between the two points A and B . Using the definition of potential at a point the potential difference between two points can be defined as :

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The potential difference between two point is equal to the work done Per unit charge in moving a positive test charge from one point to the other .

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so it can be said that if the joule of work is done in moving a charge Q coulomb from a point a to point B the potential difference between the two points A and B is

VA-VB = W/Q