compare e.m.f and p.d of cell
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bro.. simply .. emf is the potential difference across terminal of cell when no current is drawn from it ... and emf is a fixed value for a given cell .. wheras p.d. is potential across cell when current is being drawn from cell.. and it is a instantaneous value.. which is always less than emf because of potential drop inside cell...
E-V =Ir ... when I=0 , E=V ..
E-V =Ir ... when I=0 , E=V ..
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