[SOC] Question on Extra Exam

[Tom McCulloch]

    Hoping it doesn't get me kicked of SOC, I am studying for the Extra 
exam.  I am having a real problem understanding section E5 of the question 
pool (so I guess I can stay as a SOC, after all).  This the section called 
"Electrical Principles" and it deals with resonance, phases, inductors, 
capacitors and all sorts of nasty stuff.  And the graphs?? They make 
absolutely no sense to me!

    I'm using the ARRL "Extra Class License Manual" to study and it seem 
like a pretty good book, but I just don't get this section.  Can anyone here 
point me to a resource that may be more simplistically written and oriented 
to a SOC, type like myself.

    Thanks for any info you might provide.

Tom
WB2QDG