Question

Explain the statement "Potential difference between two points is 1 volt".

Hint:

The unit of potential difference is the volt, and 1 volt is the potential difference when 1 joule of energy is used to move 1 coulomb of charge.

Answer 1

The potential difference between two points is defined as the amount of work required to move a unit positive charge from one point to the other against the electric field. If the potential difference between two points is 1 volt, it means that 1 joule of work is done to move a charge of 1 coulomb from one point to another. 
Mathematically, the potential difference \( V \) is given by: \[ V = \frac{W}{Q} \] 
where \( W \) is the work done in joules and \( Q \) is the charge in coulombs. Thus, a potential difference of 1 volt means 1 joule of energy is required to move 1 coulomb of charge between the two points.