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l = 0,3 m
A = 1,5 mm² = 1,5 x 10⁻⁶ m²
ρ = 1,72 x 10⁻⁴ Ω m
Ditanya: R.....?
jawab:
R = ρl/A
R = 1,72x10⁻⁴ x 0,3 / 1,5 x 10⁻⁶
R = 0,516x10⁻⁴/1,5x10⁻⁶
R = 0,344x10²
R = 34,4 ohm