Tentang rangkain tolong dijawab

R₁ , R₂ dan R₃ di paralel

1/Rp = 1/15+1/15+1/5 = 5/15

Rp = 15/5 = 3 Ω

Arus total rangkaian

I = E/(Rp+ r)

I = 12/(3+1)

I = 3 A