Question

what is meant by saying that the potential difference between two point is 1 volt?

Answer 1

1 volt is the potential difference between two pints of a current carrying conductor when 1 joule of qork is done to move a 1 coulomb of charge.
1V = 1W / 1C
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Answer 2

potential difference between two point is equal o work done in moving aunit positive charge from one point to the other