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R = V/I V = tegangan listrik/ beda potensial
I = kuat arus
R = hambatan listrik
(2) Nilai hambatan sebuah penghantar :
R = ρ L/A ρ = hambatan jenis bahan
L = panjang
A = luas penampang
(3) Hambatan listrik berkaitan dengan suhu :
R = Ro ( 1 + α∆t)
α = koefisien suhu
∆t = perubahan suhu
Ro = nilai hambatan awal