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Homework Help: Width of wire

  1. Feb 19, 2007 #1
    What is the effect of increasing the width of a wire on it's resistance, and why?

    Thanks
    Neil
     
  2. jcsd
  3. Feb 19, 2007 #2

    cristo

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    Staff Emeritus
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    What do you think? Do you know the structure of a metal/solid?
     
  4. Feb 19, 2007 #3
    Does it decrease because there are more electrons to move freely?
     
  5. Feb 19, 2007 #4

    ranger

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    You pretty much got it. Just think of a pipe where you can vary the diameter to affect the water flow.
     
  6. Feb 19, 2007 #5
    ok thanks for the help
     
  7. Feb 19, 2007 #6

    berkeman

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    Staff: Mentor

    So now that you've figured it out with help from ranger, here is the general equation that you should memorize (yes, there are a handful of equations that you should memorize):

    [tex]R = \frac{\rho L}{A}[/tex]

    So an increase in the "width" of a conductor increases the area of the conductor, which does what?
     
  8. Mar 4, 2007 #7
    Sorry, but what does pL represent?
     
  9. Mar 4, 2007 #8

    ranger

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    p = static resistivity of material and L = length of specimen.
     
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