Furnace device

  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. Redbelly98

    Redbelly98 12,053
    Staff Emeritus
    Science Advisor
    Homework Helper

    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. 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. mgb_phys

    mgb_phys 8,952
    Science Advisor
    Homework Helper

    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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