cell emf hard

Question

EMF of cell best defined as:

RankGuru · Accepted Answer

The Electromotive Force (EMF, $E$) of a cell is the potential difference between its terminals when **no current is drawn** (open circuit).
- Physically, $E = \frac{W}{Q}$, where $W$ is the work done by chemical forces to move a charge $Q$ within the cell from one terminal to the other against the electrostatic force. 
- When a current $I$ flows, the terminal voltage $V = E - Ir$, where $r$ is internal resistance.

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cell emf hard

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