M S asked in Science & MathematicsPhysics · 7 years ago

Physics Circuit HELP!?

A Tungsten wire is 15.0 m long and has a 0.12 mm diameter. What is the resistance of this wire during room temperature?

--- Thanks in advance!

1 Answer

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  • Anonymous
    7 years ago
    Favorite Answer

    Resistivity of Tungsten = 5.6x10^-8 ohm m

    Resistance = Resistivity * ( length / cross sectional area)

    Cross sectional area = pi(r^2) = pi (1.2 * 10^-4)^2 = 4.5 * 10^-8

    Therefore

    Resistance = 5.6x10^-8 * ( 15 / 4.5 * 10^-8) = 18.67ohm

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