The diagram depicts a cell with internal resistance $1.0R$ connected to a variable resistor. When the variable resistor is first set to a resistance of $2.0R$, the current in the cell is $I_1$ and the terminal potential difference (p.d.) across the cell is $V_1$. The variable resistor is then changed to a resistance of $4.0R$. What are the new current in the cell and the new terminal p.d. across the cell?
Physics 9702 · AS & A Level · Practical circuits