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Difference between intensity and power

  1. May 8, 2009 #1
    Is there a difference between power and intensity?

    From some of the literature read(from laser specification), the impression given to me is that power is defined rather as determined over a particular beam spot size(area quantity) while intensity is defined as a quantity that is varied with time?

    Is that true?
     
  2. jcsd
  3. May 8, 2009 #2

    Doc Al

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    Staff: Mentor

    Typically: Power is energy per time; Intensity is power per area.
     
  4. May 8, 2009 #3
    Intensity is power per area ???
     
  5. May 8, 2009 #4

    jtbell

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    Staff: Mentor

    Yes: watts per square meter, or joules per second per square meter, measured on a surface oriented perpendicular to the direction of energy flow. Example: the typical intensity of sunlight is 1400 W/m^2.
     
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