Q factor definition in the context of individual reactive components In the context of individual reactive passive components e g inductors capacitors I m familiar with the following definition The aforementioned definition is presented in some form in section Individual reactive components of the article however the section Definition of the quality factor has no mentioning of it Instead the following definition is presented a definition which is practically the same as the other energy based definition in the section and furthermore includes a reference to James W Nilsson s Electric Circuits 1989 edition I ve went through a recent much newer edition of the book and found no energy based definition of any kind for Q whether for resonator circuits or individual components I therefore tagged the reference as Failed verification and additionally I wonder what is the point of this definition which is practically the same as the previous one in the article It seems to me that one of them is superfluous