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Resistivity question help

Discussion in 'Electronics Homework Help' started by Tea cup, Mar 22, 2018.

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  1. Tea cup

    Tea cup

    2
    0
    Mar 22, 2018
    The question is : Copper wire, with a diameter of 1.5mm, must be of such a length as to give a resistance of 0.6 ohms. calculate the length of this wire. Take the resistivity of copper as 0.017 microhm metres.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,079
    2,153
    Nov 17, 2011
    resistance = resistivity / cross sectional area * length
    reverse this equation to get the length from a given resistance.
     
  3. WHONOES

    WHONOES

    910
    226
    May 20, 2017
    If I remember correctly, the 0.017μΩ meters refers to a 1 Metre cube of solid copper. Calculate from there.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    10,079
    2,153
    Nov 17, 2011
    That would be valid for a cube of any size...
     
  5. WHONOES

    WHONOES

    910
    226
    May 20, 2017
    No, I think it refers to the actual resistance of the said 1 Metre cube.
     
  6. Tea cup

    Tea cup

    2
    0
    Mar 22, 2018
    Thank you for your help;)
     
  7. Ratch

    Ratch

    1,075
    327
    Mar 10, 2013
    Resistivity is an intrinsic property of a material and does not depend on the resistance value of any size or shape. In other words, a cubic foot has the same resistivity as a cubic meter of the same material.

    Ratch
     
  8. Ratch

    Ratch

    1,075
    327
    Mar 10, 2013
    Calculations are straight forward. Keep the units consistent.
    Tea cup.JPG

    Ratch
     
  9. The Electrician

    The Electrician

    112
    11
    Jul 6, 2012
    If by the phrase "resistance of the said 1 Metre cube", you mean the resistance measured between two of the plane surfaces of the cube which are on opposite sides of the cube with a perfect conductor used to make the connection to each face, you should be aware that the resistance will be the same for any size cube.
     
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