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P = 200W
I = 20ohm
V = 100 V
Dit:
panjang kawat yg diperlukan = ?
Jwb:
p = v²/r
p = 100²/R
p = 10.000/R
R = 10.000/P
R = 10.000/200 = 50m
Semoga bisa membantuu, maaf jika salah