Question

What is potential difference?

Answer 1

potential difference between two points through which a current is following is defined as the amount of work done to move a unit charge .it is denoted by V
V= w/q

Answer 2

Volatage, electric potential difference , electric pressure  or electric tension (formally denoted ∆V or ∆U, but more often simply as V or U, for instance in the context of owm'sor Kirchhoff's circuit laws) is the difference in electric potential  between two points. 
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