Difference between intensity and power

[watertreader]

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?

 

[Doc Al]

Typically: Power is energy per time; Intensity is power per area.

 

[Mr_Chen]

Intensity is power per area ?

 

[jtbell]

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.