How to solve a circuit

How we calculate V,R and I in the following circuits?

• Rt, It, V1, V2 and V3 ?

1. Rt= R1+R2+R3 >> Rt= 10+20+30= 60Ω
2. It= Vt: Rt >> It= 180: 60= 3A
3. V1= R1x It>>V1= 10x3= 30v
4. V2= R2x It>>V2= 20x3= 60v
5. V3= R3x It>>V3= 30x3= 90v

• Rt, It, I1, I2 and I3 ?

1. Rt= 1:[(1:R1)+(1:R2)+(1:R3)]>> Rt= 1:[(1:15)+(1:5)+(1:10)]= 2.72Ω
2. It= Vt: Rt>> It=5: 2.72= 1.83A
3. I1= Vt: R1>> I1=5: 15= 0.33A
4. I2= Vt: R2>> I2=5: 5= 1A
5. I3= Vt: R3>> I3=5: 10= 0.5A

• Rt, Rtp, It, I1,I2,I3,I4 ?

1. Rtp= 1:[(1:R1)+(1:R2)+(1:R3)]>>                                          Rtp={1:[(1:3)+(1:6)+(1:3)]}=1.2Ω
2. Rt=R4+Rtp>> Rt=2+1.2=3.2Ω
3. It=Vt: Rt>> It=9: 3.2=2.8A
4. I1= Vt: R1>> I1=9: 3= 3A
5. I2= Vt: R2>> I2=9: 6=1.5A
6. I3= Vt: R3>>I3=9:3= 3A
7. I4=It>> I4=2.8A