tolong ya bro no 4 dan 5 kalo bisa pake caranya ya.makasih :)

4) diket :
seri paralel
R1 = R2 = 4 ohm
R3 =R4 = 8 ohm
R5 = 5 ohm
dit : hambatan pengganti
jwb :
# seri
Rs = R1 + R3 +R5
Rs =4 + 8 +5 = 17 ohm
#paralel
1/Rp = 1/R2 +1/Rs +1/R4
1/Rp = 1/4+1/17+1/8
1/Rp =34/136+8/136+17/136
1/Rp = 59/136
Rp = 136 /59 = 2,3 ohm
jadi hambatan penggantinya 2,3 ohm
5)diket :
P = ( 2 . 40 ) + ( 4. 60 ) = 320 w
t = 6 jam / hr
tarif = Rp 750,00
dit : Biaya 1 bln ( 30 hr )
jwb :
# Total Energi
W = P . t
W = 350 . 6 . 30
W = 57.600 wh = 57,6 kwh
# Biaya = W . tarif
Biaya = 57,6 . 750
Biaya = Rp 43.200,00