Question

what do you mean by potential difference of 1 volt??

answer:

work done in moving a unit positive change through distance ∆l
E*∆l=Va-Vb=V-(V+∆V)=∆V
therefore , E= -∆V/∆l

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Answer 1

Potential difference. ... The potential difference between two points is said to be 1 volt if the work is done in moving 1-coulomb charge from one point to other is 1 joule.

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