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P = 5 watt
t = 9 jam
banyak hari = 30 hari
dit ; W ?
dijawab :
Pemakaian 30 hari = 9 jam x 30 hari = 270 jam
maka :
W = P x t
= 5 x 270
= 1.350 watt jam
= 1.350/1000
= 1,35 KWh
catatan : 1 kWh = 1.000 watt jam