Also, check this diagram here :
https://3.bp.blogspot.com/-Yc7foXYMC58/WmUmqYWR_MI/AAAAAAAAAUk/dl5jRq-YLBUnmQj3JFCuxh5EFjRIj-r6gCLcBGAs/s1600/powerrig.png

A more clear representation of what I wanted to say with my post above.