Power versus Control

Since I wrote about control yesterday, I've been talking to people and became interested in the difference between power and control. Afterall, the title of this blog is The Power of eLearning. It seems like people experience power when they have choices.
...Do you want coffee, tea or water?
...Would you like to sit in the front or the back?
...Click on the areas that interests you.
...Would you like to take the course now or tonight or tomorrow?
Maybe control and power are synonomous? Control has a somewhat negative conotation in our culture (control freak! Losing control!). Of course, I think of power in a positive way, however, some people do think of it as a controlling or dominating. Isn't language funny? I'll have to explore this some more.