jawab no.20 & no.21. tolong di jawab cepat!!

20. - lampu = 4 x 10 x 10 = 400 Wh
- tv = 80 x 5 = 400 Wh
- kulkas = 250 x 24 = 6000 Wh

total = 400+400+6000
= 6800 Wh : 1000
= 6,8 kWh

tarif = 6,8 kWh x 700 x 30 hari
= 4760 x 30
= Rp. 142.800,00 (b)

21. N1/N2 = I2/I1
600/120 = 4/I1
4x120 = 600I1
I1 = 480/600
= 0,8 A (c)

20.
sehari
lampu : 4 × 10 W × 10 h = 400 Wh
TV : 1 × 80 W × 5 h = 400 Wh
kulkas : 1 × 250 W × 24 h = 6000 Wh

jumlah Wh = 6800 Wh
kWh = 6,8 kW

sebulan 30 × 6,8= 204 kWh

harga yg hrs di bayar dlm 1 bulan :
Rp 700 × 204 = Rp 142.800

21. dik: Np = 600
Ns = 120
Is = 4 A
dit : Ip
jwb:
Ip / Is = Ns / Np
Ip / 4 = 120 / 600

perkecil
Ip / 4 = 12 / 60

kali silang
Ip . 60 = 4 . 12
Ip . 60 = 48
Ip = 48/60
Ip = 0,8 Ampere