Sebuah rumah menggunakan peralatan listrik 6 lampu 25 walt, tv 2 buah masing 50 walt.mesin cuci 300 walt dan jika 1 kwh Rp 1500.berapa banyak listrik jika setia

nlampu = 6
Plampu = 25 W
ntv = 2
Ptv = 50 W
ncuci = 1
Pcuci = 300 W
1 kWh = Rp. 1.500
t = 3 Jam

Wh = n × P × t
Whlampu = 6 × 25 × 3 = 450 Wh
Whtv = 2 × 50 × 3 = 300 Wh
Whcuci = 1 × 300 × 3 = 900 Wh
Whtotal = 900 + 300 + 450 = 1.650 Wh
1.650/1.000 = 1,65 kWh
1,65 × 1.500 = Rp. 2.475
Biaya(30 hari) = 2.475 × 30 = Rp. 74.250