1. The problem statement, all variables and given/known data What of the following is measured by the energy dissipated when a cell drives a unit charge round a complete circuit? A- Resistance B- Power C- Potential Difference D- e.m.f 3. The attempt at a solution e.m.f is energy converted from non-electrical to electrical form when 1 C of positive charge pass through a cell. P.d is the energy converted from electical to other forms when 1 C of positive charge passes between 2 points.