-Circuito En Serie:

-.R1XR2:R1+R2=130X1000:100+130=250.
-R12XR3:R12+R3=250X120:370+120=RT=80.
-IT=VR1:R1/9V:1K: 9mA.
-IT VT:R1/ 9V:80=0'11=11mA.
-IT12= VR2:2/9:330= 27mA.
-IR2=VR3:3/9V:120=75mA.
-R12xR3:R12+R3=250x120:370+120=RT=80 OHM.
-V1=9V.
-V2=9V.
-V3=9V.
-IR1+ 1/R2+IR3