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Efficiency and temperature of cooking device

  1. Dec 9, 2008 #1
    1. The problem statement, all variables and given/known data

    Suppose a cooking device has a power of P Watts. The temperature of the bulb which radiates heat is determined to be T (in Kelvin). Write an expression for efficiency in terms of T and P.

    2. Relevant equations

    E = [tex]\sigma[/tex][tex]T^{4}[/tex] Stefann Boltzmann equation
    [tex]\eta[/tex]= heat/electrical input

    3. The attempt at a solution

    Efficiency = [tex]\sigma[/tex][tex]T^{4}[/tex]*A/P, where A is area.
    Is the amount of heat simply given by the Stefann-Boltzmann equation?
    Should I use the Planck distribution?
    Is electrical input simply equatl to P?
  2. jcsd
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