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Eighteen-gauge wire has a diameter of 1.024 mm. Calculate the resistance of 19 m of 18 gauge lead wire at 20°C.

  • Physics/electricity -

    The answer is 5.075 ohms

  • Physics/electricity -

    resistivity at 20℃ is
    ρ=22•10⁻⁸ Ohm•m

    R= ρL/A= 4ρL/πD²=
    =2•22•10⁻⁸•19/ π(1.024•10⁻³)²=
    =5.076 Ohms

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