The diagram illustrates a simple circuit. Which statement is correct?
- AWhen switch S is closed, the electromotive force (e.m.f.) of the battery falls because work is done against the internal resistance of the battery.
- BWhen switch S is closed, the e.m.f. of the battery falls because work is done against the resistance $R$.
- CWhen switch S is closed, the potential difference across the battery falls because work is done against the internal resistance of the battery.
- DWhen switch S is closed, the potential difference across the battery falls because work is done against the resistance $R$.