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Furnace device

  1. Dec 6, 2008 #1
    1. The problem statement, all variables and given/known data
    see attachment


    2. Relevant equations



    3. The attempt at a solution
    I do not understand the diagram.
     

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  2. jcsd
  3. Dec 7, 2008 #2

    Redbelly98

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    The two lines labelled AB are actually strips of two different metals, attached to each other (usally be welding them together, I think)

    When the temperature changes, the metal strips curve or bend to the right and touch the thing in the upper right of the figure.
     
  4. Dec 8, 2008 #3
    So, they expand and contract which is determined by the temperature from the heat given off from the furnace. Why are two different metals used?
     
  5. Dec 8, 2008 #4

    mgb_phys

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    They expand different amounts with temperature and so bend - the bending amplifies the very small change in length.
     
    Last edited: Dec 8, 2008
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