1) A circuit contains a battery with emf= 60.0 V without internal resistance and four resistors R1 = 3.00 , R2 = 6.00 , R3 = 12.00 , and R4 = 4.00 . Find the current flowing through each resistor

2) A circuit contains three batteries with emf's e1 (unknown), e2 (unknown), and e3 = 20.0 V and internal resistances r1 = 1.00 , r2 = 1.00 , r3 = 1.00 , and resistors R1 = 4.00 , R2 = 2.00 , and R3 = 6.00 . Find the emf's e1 and e2.