- #1

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I'm confused because we still consider resistors that are on the branches of the +/- terminals of the open circuit voltage.

Thanks!

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- Thread starter Naakicibi
- Start date

- #1

- 3

- 0

I'm confused because we still consider resistors that are on the branches of the +/- terminals of the open circuit voltage.

Thanks!

- #2

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- #3

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Thank you very much, that made it very clear. Maybe you could help me with a similar situation; what should I do when given a voltage source and a resistor in parallel with a short circuit (this time I'm not considering a thevenin equivalent)

- #4

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- #5

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http://postimg.org/image/69pyh7uun/

Thanks for your help, I have linked the circuit I am analyzing, and at this point I'm just unsure how to deal with the short circuit all together... I'm asked to find i(0), so I used mesh-current analysis of the middle mesh (when t<0) to get a short circuit current of .1 A, which is the steady state current before t=0. Then when t > 0 and the short circuit is removed, I get i_sc = .1625 A. These values don't seem right because later I'm asked to compute when i = 0, which never occurs with my transient function derived from these currents.

For t<0, does all of the current produced from the voltage and current sources only flow through the short circuit branch, and thus cancel out the branch with the 30 ohm resistor?

thanks again

- #6

donpacino

Gold Member

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For t<0, does all of the current produced from the voltage and current sources only flow through the short circuit branch, and thus cancel out the branch with the 30 ohm resistor?

no current will still flow through the 30 ohm resistor.

when you say i_sc, do you mean i(t)?

also unless you are finding steady state current I(t) should be a function of t because of the inductor.

- #7

donpacino

Gold Member

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for t=inf I get i(t)=0.01625A so assuming one of us is simply off by a factor of 10 it looks like your number is correct.no current will still flow through the 30 ohm resistor.

when you say i_sc, do you mean i(t)?

also unless you are finding steady state current I(t) should be a function of t because of the inductor.

I would not call it I_sc, as sc often stands for short circuit.

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