# Capacitance in RLC circuit

Discussion in 'Homework Help' started by Biggsy100, May 23, 2015.

1. ### Biggsy100 Thread Starter Member

Apr 7, 2014
88
1
I am having trouble working out how to equate capacitance in an RLC series circuit. I have a small paper with both series and parallel RLC circuit question (attached) I believe my equations are correct up until the last capacitance question then I am stuck. I'd greatly appreciate confirmation I am on the right track and guidance in working out capacitance.

A coil of resistance 20Ω and inductance 200mH is connected in Parallel with a 4µF capacitor across a 50V, Variable frequency supply, Calculate

1. The resonant Frequency

=

2. Dynamic Resistance

=
(c )The current at resonance

= 2.5A

(d ) & The Q-Factor of the circuit at resonance

=

The current at resonance in a series LCR circuit is 135µA. If the applied voltage is 3.5Mv at a frequency of 200kHz, and the circuit inductance is 47µF, Calculate:

(a ) The circuit resistance:

= 20.357

(b ) The circuit capacitance:

= = ???