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(2) P = I² . R
(3) P = V² / R
Diket : V (tegangan)= 220 v dan P (daya) = 100
maka lebih baik menggunakan rumus yang ketiga
P = V² / R
R = V² / P
R = 220² / 100 = 48400 / 100 = 484 Ω