This seems good to have a evaluation scale. It lets you know where you need work on your self to improve.

This is similar to Stingray's focus blocks but with a set in place definition like the emotional scale.

I think this could be a handy device to evaluate how things are as compared to how things ought to be.

It is hard to say the points where changes in the degree of power are initiated in the realm of spirit. People generally will attempt to understand a new concept by relating it to a similar existing one. When considering power, most people equate changes of power with a corresponding change acoustically.  We hear the increase of horsepower that happens when stepping on the gas pedal.  Movies always use sounded effects and volume changes to indicate an increase or decrease in power.  Music seems more powerful if the volume is increased. 
The power changes that occur during the process of manifestation through law of attraction, are much more difficult to distinguish.  They do involve vibration so there may be an audio indication outside of our range of perception. There may be other indicators that we are not aware of or insensitive to.  Certain individuals may be.  Even if we have or had the capability of sensing subtle changes in power, it is unlikely that we would be paying attention closely enough to recognize them.  The diagram below is roughly based on Bashar's 7 steps to manifesting. It's accuracy and any value associated with have a scale of power as a tool, is undetermined, and in all probability, unnecessary.  Your question, however, was thought provoking.

Emotions are basically

Happy, Sad, Fear, Anger.

and from these biologically based emotions all the others have evolved in humans.

Emotions are energies that allow organisms to behave in a certain manner.

The scale of power, the scale of emotions? I like what Melody Fletcher says about the spectrum of empowerment that she refers to in her book Deliberate Receiving;

"Keep in mind that the spectrum is fluid. No one permanently hangs out in any one spot. And while you'll usually occupy a certain range on the spectrum (it's unlikely that you'll feel total passion in one moment and total depression in the next), you can move about quite a bit within that range. So, while you may feel enthousiasm most of the time, you may feel anger on a certain issue. The key is not to demonize any one emotional group, but to recognize that all have value ... if you know how to move from one side of the spectrum to the other, and you know it's not hard to get that broader view (clarity, solutions) you want, then you'll stop thinking in terms of negative spectrum equals bad, and positive spectrum equals good. You'll simply go where you need to go on the spectrum in order to get the information or experience you want."