Hitunglah arus listrik yang mengalir (i) melalui tiap rangkaian pada gambar berikut

1. rangkaian seri 3+3 = 6 ohm
i=V/R = 9/6 Ampere atau 3/2 Ampere
2. rangkaian paralel 1/R = 1/3 + 1/3 = 2/3 maka R =3/2 ohm
I = V/R
= 18÷ 3/2
= (18 x 2)/3
= 36/3
= 12 Ampere

3. seri 1 ohm dan 2 ohm
Rseri = 1 +2 = 3
1/Rparalel = 1/3 + 1/3 = 2/3
R = 3/2 ohm
I = 15÷(3/2)
I = (15×2)/3
I = 30/3 = 10 Ampere