Three equal resistors R are connected to a battery as shown in the figure below. The electric potential across the battery terminals when unconnected...

Three equal resistors R are connected to a battery as shown in the figure below. The electric potential across the battery terminals when unconnected to this circuit is 9 V. Considering a value of r = 0.5 Ω for the internal resistance of the battery and a value of R = 5.5 Ω for the three resistors, find

1. the voltage across the battery terminals when the switch is open

2. the voltage across the battery terminals when the switch is close