A cell that has internal resistance is joined to a variable resistor $R$ as shown. The resistance of $R$ is then reduced step by step. What happens to the current $I$ and to the terminal potential difference (p.d.) across the cell?
- Acurrent $I$ decreases; terminal p.d. decreases
- Bcurrent $I$ decreases; terminal p.d. increases
- Ccurrent $I$ increases; terminal p.d. decreases
- Dcurrent $I$ increases; terminal p.d. increases