jawaban nomor 13 sama caranya

R1 = 30 ohm
R2 = 60 ohm
R3 = 20 ohm
R4 = 10 ohm
I = 0,5 A

R1,R2,dan R3 paralel maka :
1/Rp = 1/R1 + 1/R2 + 1/R3
1/Rp = 1/30 + 1/60 + 1/20
1/Rp = 2/60 + 1/60 + 3/60
1/Rp = 6/60
Rp = 60/6
Rp = 10 ohm
Rs = Rp + R4
Rs = 10 + 10
Rs = 20 ohm

V = I × Rs
V = 0,5 × 20
V = 10 v

Jadi besar tegangan V pada rangkaian tersebut adalah 10 volt (C)