tolong dibantu yah​.....

17. Imasuk=Ikeluar
20 A = I1+I2+I3
20 A = 3 A + I2 + 3 A
20 A = 6 A + I2
I2 = 20 A - 6 A
I2 = 14 A
18. B
19.
Rs1= R2+R3=10+10=20 ohm
Rs2=R4+R5=40+20=60 ohm
1/Rtotal=1/R1+1/Rs1+1/Rs2
1/Rtotal=1/30+1/20+1/60
1/Rtotal=2/60+3/60+1/60
1/Rtotal=6/60
Rtotal=60/6
Rtotal=10 ohm
20.
1/Rp=1/R2+1/R3=1/2+1/2=2/2=1 ohm
Rtotal=R1+Rp=6+1=7 ohm
V=I.R
14=I(7)
I=14:7
I= 2A