Sure it can. Power = work/time. *grin* To seriously respond, an accurate measurement is definitely difficult as we don't have a unit for personal power and power can be expressed in many different ways. However, it is possible to to compare one power to another. While this can't be done in a purely scientific way (outside of physical power), we can get a fairly good idea by taking two individuals with a different amount or type of power, have them try to accomplish a variety of tasks, and score them on speed and quality. It won't be a perfect test, it ought to be able to give a coarse idea of how various types of power stack up.