# A Few Inductor/Capacitor Problems - Am I going in the right direction?

1. Oct 9, 2006

### verd

Hey,

I've got a couple of problems here that seem pretty simple... And I've worked through them and everything, I just have no basis of comparison, no way to even remotley guess if I'm doing the right/wrong thing. At all... What I'm doing makes sense, but I was wondering if someone could possibly glance through these and tell me if what I'm doing is correct??

First Problem:
The voltlage across a 2F capacitor is given by the waveform (on the left). Find the waveform for the current in the capacitor.

(Work shown with my waveform to right)

Second Problem:
The voltage across a 2H inductor is given by the waveform shown below. Find the wave form for the curren in the inductor.

Third Problem:
Find the value of C if the energy stored in the capacitor below equals the energy stored in the inductor.

My steps:

Fourth Problem:
Given the network shown below, find the (a) equivalent resistance at terminals A-B with terminals C-D short circuited, and (b) the equivlaent inductance at terminals C-D with terminals A-B open circuited.

Now, I'm a bit confused about this one... I've never really encountered anything like this... In part a, I figure I'd treat this circuit like it were a bunch of resistors being shorted, so I end up with 20mH+6mH, which gives me 26mH...

And then for part b (this is where I'm lost), would I just treat this like a ladder of resistors? I know inductors act like resistors in that you add them up when they're in serial and add their inverses when in parallel... So would I have 20mH+12mH+6mH=38mH in parallel with the 5mH... And I get a nuts answer like 190/43=4.4186mH

How would I approach this? I'm a bit lost.