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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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    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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