Subject: Re: A question about LCR circuits Date: Fri, 16 May 1997 07:54:04 +1200 From: "Malcolm Watts" <MALCOLM@directorate.wnp.ac.nz> Organization: Wellington Polytechnic, NZ To: tesla@pupman.com John, I missed something in my last reply.... <snip> > As Z = sqrt(L/C) this gives Q = Z/R = cos A Error, error! sqrt(L/C) = X, _not_ Z. Impedance takes resistance into account as well. X is a purely reactive quantity. Malcolm <snip>