Question

When do we say that the potential difference between two points of a circuit is 1 volt. what does this actual means

Answer 1

Two points are said to have a potential difference of 1 volt when work of 1 joule is done by transferring a charge of 1 coulomb between the two points.

Answer 2

In an electric circuit, when 1 joule of work is done in order to transfer 1 coulomb of electric charge from one point to another, then it is said that there is 1 volt of potential difference between those two points.

Potential difference or Voltage is described as the difference in potential between two terminals of a electric field.

Additional details:

Voltage = Power / Current.

Power is measured in Watt.

Voltage or Potential difference is measured in Volt.

Current is measured in Ampere.