A cell has a constant electromotive force. A variable resistor is placed across the terminals of the cell. The resistance of the variable resistor is reduced. Which statement correctly describes how the cell’s terminal potential difference (p.d.) changes?
- AThe terminal p.d. is decreased because more work is done moving unit charge through the internal resistance of the cell.
- BThe terminal p.d. is decreased because the current in the variable resistor is decreased.
- CThe terminal p.d. is increased because more work is done moving unit charge through the variable resistor.
- DThe terminal p.d. is increased because the current in the variable resistor is increased.