How Do You Determine Thevenin Resistance in RLC Circuits for DC and AC?

[drecklia]

I want to know how to find the R thevenin of an RLC circuit. Do I short the inductor and open the capacitor? or do I remove both capacitor and inductors?

 

[The Electrician]

I want to know how to find the R thevenin of an RLC circuit. Do I short the inductor and open the capacitor? or do I remove both capacitor and inductors?

There's more than one kind of RLC circuit. You should show a schematic.

 

[Mr.Green]

It depends on whether you have a DC circuit or an AC circuit.

1) DC

A) Since the reactance of an inductor is given by:
XL = j*(2 * pi * f * L)
and (f = 0) in a DC circuit, so inductor is replaced by a short circuit. ( An element with zero reactance or resistance)

B) For the capacitor:
Xc = 1 / (j*(2 * pi * f * C))
Substituting zero for f, the answer will be infinity (an open circuit).

2) AC

The value of frequency is substituted in each case and a reactance will be obtained for each element. Neither the inductor nor the capacitor will be replaced with short or open.