What is meant by saying that the potential difference between two points is 1 V?
When we say that the potential difference between two points is 1 V, it means that 1 joule of work is done to move a charge of 1 coulomb from one point to the other in a current carrying conductor.
The potential difference between two points in an electric circuit is defined as the work done to move a unit charge from one point to the other. Mathematically, V = W/Q, where V is potential difference, W is work done, and Q is charge.
Therefore, 1 volt = 1 joule/1 coulomb or 1 V = 1 J C⁻¹.
Explanation
The textbook explicitly defines one volt as 'the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other.' This is a standard 2-mark definition question that tests the student's understanding of the relationship between work done, charge, and potential difference. The formula V = W/Q and its unit equivalence (1 V = 1 J C⁻¹) should be included for full marks.