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Hambatan tiap meternya = 20 ohm
Jika alat dipasang di tegangan 125V, berapa panjang kawatnya?
P = V²/R
300 = 125²/R
R = 125²/300 = 625/12 ohm = 52.08 ohm
Untuk 1 meter itu berati 20 ohm
Sehingga tiap meter nya dibutuhkan 52.08/20 = 2.604 meter kawat