jawaban nomor 13 sama caranya

R1,R2,dan R3 dipasang pararel
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

Rp dan R4 dipasang seri
Rs = 10 + 10
Rs = 20 ohm

V = I × Rs
V = 0,5 × 20
V = 10 volt (C)