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SMP KELAS 9
Diketahui :
l = 20 m
A = 0,25 mm² = 0,25x10⁻⁶ m² = 25x10⁻⁸ m²
ρ = 10⁻⁶
Ditanyakan : R ?
Dijawab :
R = ρ L/A
= 10⁻⁶ x 20 / 25x10⁻⁸
= 0,8x10² Ohm
= 80 ohm