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P = 5 watt
t = 9 jam
Ditanyakn : W selama 30 hari ?
Dijawab :
W per hari = P x t
= 5 x 9
= 45 watt jam
W per 30 hari = 45 x 30
= 1.350 watt jam
= 1,350 KWH
catatan = 1 KWH = 1000 watt jam