This is a question about Kirchoff's rules.
Consider the group of resistors shown in the attachment, where R1 = 4.0 ohms and E = 9.1 V.
Find the current in each resistor.
And determine the potential difference between points A and B.
Please see attached for diagram.
The solution supplies an attachment containing the full written explanation of how to apply Kirchoff's rules to the group of resistors described, complete with helpful diagrams.