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Michael
Michael asked in Science & MathematicsPhysics · 7 years ago

Physics Resistance Question. (A Level)?

Can anyone give me an answer to this problem.

Power is sent to a garden lamp by a flexible cable. The cable consists of two conductors, each of length 6.5 m, in series. Each conductor has 27 strands of thin copper wire, each with diameter 0.1 mm. The resistivity of copper is 1.7x10^-8 Ω m.

Calculate the total resistance of the cable.

Thanks!

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  • pollux
    Lv 5
    7 years ago

    resistance = (resistivity x length ) ÷ area of wire

    Area = 27 x pi x r²

    Area = 27 x 3.14 x (.05 /1000)²

    Resistance = (1.7 x 10^ -8 x 6.5 x 2) ÷ (27 x 3.14 x (0.5 /1000)²)

    R = 0.26 ohms

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