Kuat arus listrik yg mengalir pd rangkaian tersebut?

diket. R1 , R2 =20 ohm
R3 =40 ohm
V= 12 v
paralel
dit. I ?
jawab :
1/Rp=1/R1+1/R3+1/R3
=1/20+1/20+1/40
=2/40+2/40+1/40
=5/40
Rp=40/5 =8 ohm
jd I =V/R
=12/8
=1,5 A