Which statement about the electromotive force (e.m.f.) of a cell is always correct?
1 )
The e.m.f. is the energy converted from electrical to other forms in the cell.
The e.m.f. is the energy provided by the cell per unit charge passing through it.
3 )
The e.m.f. is the potential difference across the internal resistance of the cell.
4 )
The e.m.f. is the potential difference across the terminals of the cell.
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