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P = V^2 /R
80 = 220^2 / R
80= 48400/R
R = 605 Ohm
P= V^2 /R
= 110^2/605
= 12.100 / 605
= 20 Watt
Sebenarnya Kalo Pake perbandingan lebih gampang sih
Tapi jawabnya tetap sama kok
Semoga Membantu ^^