Question about potential difference.

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yaseen shah
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yesturday I read in a book that it is not correct to say that p.d is the work done in moving a unit charge between the points concerned i can not understand that point please explain that!
 

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Emf is the work done by a Source in moving a unit charge across a circuit. P.D. is energy dissipated by some component in a circuit (e.g. resistor). Its like energy going in:emf and energy going out:pd.
 

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