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Resistance question

  1. Feb 12, 2009 #1
    1. The problem statement, all variables and given/known data

    A rectangular solid made of carbon has sides of lengths 5.5 cm, 11.0 cm, and 22.0 cm, lying along the x, y, and z axes, respectively (Fig. 18-35). Assume the resistivity of carbon is ρ = 3.0 multiplied by 10-5 ·m.

    http://www.webassign.net/giancoli5/18_32alt.gif" [Broken]

    Figure 18-35

    (a) Determine the resistance for current that flows through the solid in the x-direction.

    (b) Determine the resistance for current that flows in the y-direction.

    (c) Determine the resistance for current that flows in the z-direction.

    2. Relevant equations

    R = ρL/A

    3. The attempt at a solution

    Okay I think the only thing thats screwing me over is the area. I dont know what to multiply with what in order to get the correct area. For the x I've tried multiplying the 5.5 and 11.0 but wrong answer. *sigh*

    Thanks alot to whoever can help :D
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Feb 13, 2009 #2


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    Homework Helper

    The area is taken in the direction of the current flow.

    In the x direction that's A=y*z and L = x

    Be careful of units. cm = .01 m.
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