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V1 = 220 v
P1 = 60 w
V2= 110 v
Dit : Daya yg dibutuhkan......?
Jwb :
P2 = (V2 / V1)^2 . P1
P2 = ( 110/220)^2 . 60
P2 = 0,5^2 . 60
P2 = 0,25 . 60
P2 = 15 w
Jadi daya yg dibutuhkan jika dihubungkan pd teg. 110 v adalah 15 watt