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V₁ = 220 V
V₂ = 110 V
P₂ = ...........?
Penyelesaian :
P₂ = (V₂/V₁)² • P₁
P₂ = (110/220)² • 25
P₂ = (0,5)² • 25
P₂ = 0,25 • 25
P₂ = 6,25 Watt
Jadi, daya lampu akan menjadi 6,25 W
P₂ = (110/220)² x 25
P₂ = (0,5)² x 25
P₂ = 0,25 x 25
P₂ = 6,25 Watt