Difference between intensity and power

  • #1

Main Question or Discussion Point

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?
 

Answers and Replies

  • #2
Doc Al
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Typically: Power is energy per time; Intensity is power per area.
 
  • #3
4
0
Intensity is power per area ???
 
  • #4
jtbell
Mentor
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3,296
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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