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Learnphysics
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Homework Statement
http://imgur.com/izloBbW
http://imgur.com/izloBbW
Essentially I've been attempting to solve the first question.
Homework Equations
I'm mostly concerned on the methodology to solve such a question; So far I've been attempting the following:
As always with these questions I'm seeking the Open circuit voltage, and the short circuit current and saying V/I=Rthevenin.
The trick is in finding Voc, and Isc
For Voc I first found the voltage at the node connected to the positive of the capacitor; this was a long process involving finding the complementary and particular solutions and adding them. I wasn't sure how to solve the constants that arose from this, so I made the assumption that at time = 0, capacitor voltage will be 0. (Note the question doesn't mention initial conditions)
Then I simply multiplied Vc by 3, because Va=vc+(2*Vc),Va=3vc.
To find Isc, I realized that Va =0 volts, and because Va=(vc*3) then Vc=0. (i'm fairly sure I'm far offtrack with this one)
To find the current through the 6ohm resistor we can simply say Vs/6. (with Vs being a sinusoid). subtract from this the current through the capacitor (KCL at a node).. and I assumed that would be ISC.
Where am I wrong, if I was ever on the right track, and what's the preferred method to solve something like this.
Thanks
Homework Statement
Homework Equations
The Attempt at a Solution
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