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What is the difference between an open circuit and a short circuit?

Open circuit has no current, so does that mean any resistor in series with it, has no current ,so it can be ignored for analysis( v=ir so 0 current means 0 V) for finding lets say the Thevenin equivalent.?

Now for Short circuit, do we ignore a resistor in series with the short, because current will take path of least resistance and ignore that resistor?

Also can short circuit have voltage through it ?

Now lets take a look at some problems i have right here, and i cant do....

Now lets say i want Thevenin equivalent at the 4H inductor, so i do the Isc(t<0 which makes it closed switch to charge the inductor), i would use mesh analysis and find the current through the 8 ohlm resistor, which will give me my Isc, this correct ?

NOw for the Voltage open circuit, im confused on what to do , since Its open circuit , i ignore the 8 olhm resitor correct ?

Now another problem i have is this one ...:

Now if swithc is t<0 then the isc is just 40/5k which is .008A, now what is the Voltage open circuit, i dont understand how to calculate it, cause when i take Vth/Isc i dont get teh 2k olhms resistance i should have in the back of the book, what am i doign wrong ?

Any help would be great , thanks

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# Short Circuit, and open circuit question

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