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P = 300 W
V = 125 V
R/ℓ = 20 Ω/m
P = V²/R
300 = 125²/R
R = 125² / 300 Ω
R/ℓ × ℓ = R
20 × ℓ = 125² / 300
ℓ = (125² / 300) / 20 ≈ 2,6 m ← jawaban
Panjang kawat yang diperlukan 2,6 m (pembulatan)
Ok ?