E=8V, internal resistance R1=0.5Ω
V=120V, resistance R2=15.5Ω
Effective voltage V′=V−E=112 V
I=V′R1+R2=7 A
Voltage across R1=IR1=3.5 V
Terminal voltage =8+3.5=11.5 V
Series resistor in the charging circuit limits the current drawn from the external source.