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Homework Help: REsistance, colour and heat.

  1. Dec 17, 2008 #1
    my set up was thus;

    bunsen burner and around 4 metal plates of various colours.
    certain colours absorbed more heat energy.
    because temperature and resistance are linked i hypothesized
    more temperature increase would mean less resistance.
    when doing the practical the values i got were illogical.

    why was this?
    how could i redo and get apropriated answers?.
  2. jcsd
  3. Dec 17, 2008 #2


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    Science Advisor
    Homework Helper

    The temperature of the plates depends on how efficently they absorb or reflect the radiation from the flame.
    This has nothing to do with their resistance, although the resistance of a material does vary with temperature the absorption just depends on the color and roughness of the surface.
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