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Homework Help: PC Cell Efficiency

  1. Aug 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A photovoltaic cell has area 80 sq cm and efficiency converting energy in the form of sunlight to electricity of 7%. The sun's intensity is 800 W / sq m and the rays are perpendicular to the cell's surface.
    What power will be produced by this cell (in W)? Take care in converting to SI units.

    2. Relevant equations


    3. The attempt at a solution
    80*10^-2 *.07 * 800 = 44.8

    but the back of the books says the answer is .45
  2. jcsd
  3. Aug 25, 2009 #2


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    1 cm = 10-2 m

    (1 cm)2 = (10-2 m)2 = ?

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