# Capacitors, Inductors and Transient Circuits

Discussion in 'Homework Help' started by Alustriel, May 24, 2009.

1. ### Alustriel Thread Starter Member

Apr 1, 2009
14
0
We're just entered this part of the book in our electric course. The thing is, I've read through the whole text book and even the information on this website and I still don't understand a thing. Here are some of the easier examples from the book, I hope you guys can guide me along the way as I try to master capacitance, inductance and transient circuits.

*Solved* Will be updating with other questions soon, stay tuned

Last edited: May 25, 2009
2. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
782
Q1 1.67 mF is right

Q2 Remember 1/Z=1/R+1/(jωL)+jωC so for Z to be real the terms in 'j' must vanish or reduce to zero.

Q3 The total stored energy at steady state = Inductor energy + Capacitor energy. At steady state the source current will divide between R1 & R2 and C will have charged to its final value. The voltage across R1 (and / or R1 || R2) at steady state will equal the capacitor voltage. For the purposes of analysis at steady state consider C as an open circuit and L as short circuit.

Q4 Before t=0 the inductor will be "charged" with a certain current. When the switch opens the current can only flow around the L || R1 loop. That loop will decide the time constant after t=0.

3. ### Alustriel Thread Starter Member

Apr 1, 2009
14
0
Hey thanks, managed to solve em all