ini apa ya? E = 12 volt r = 1 ohm

cari hambatan paralelnya dulu

1/rp = 1/15 + 1/15 + 1/5
rp = 15/5 = 3

V = E
12 = I . ( Rp + r)
12 = 4 I
I = 3 Ampere

Cari hambatan pararel ((hambatan total seluruhnya hambatan pararel))
1/Rp = 1/5 + 1/15 + 1/15
1/Rp = 3/15 + 1/15 + 1/15
1/Rp = 5/15
Rp = 15/5 = 3 ohm

E = I (R + r)
12 V = I (3 ohm + 1 ohm)
12 = 4I
I = 3 A