Dear friends,

I would like to know the total Rf equation for this circuit. I will be gla dif I can get some help here as I am very close to the solution of my problem.

Here is the link to look at the circuit.

http://i783.photobucket.com/albums/yy113/sandhi_prashant/Rfequation.jpg

with best regards,
Sandhi

 

Not quite sure what the point of the exercise is, but I get the following relationship for Rf (which I haven't double checked)

\(Rf=\frac{jXc}{1-\frac{jXc}{Rm+Rv-\frac{UgRm}{Um}}}\)

where

\(Xc=\frac{1}{\omega Ce}\)

 

A point to note (if the relationship I gave is indeed correct) is that Rf should be purely resistive and hence the imaginary term(s) in the derived value of Rf should be zero. This means Um would have a complex value such that the aforementioned condition is met.