please could someone point me in the direction of a site that includes formulas for rlc networks. I have to find current and voltage through three components in a circuit. an inductor in series, a capacitor in parallel and another inductor in series. its a third order butterworth passive filter.

I have found formulas but only for one inductor in series and one capacitor in parallel.

does much change when you add another inductor in series?

I mean when working out the current and voltage?

do you have to include all three components in the formula or can you do the first two (inductor/capacitor) and then using that result for the second series inductor?

all the best

simon