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#1




What is infinite resistance?
I'm trying to solve a series circuit question from my DC Circuits class homework, and I can't seem to recall what infinate resistance means.
Here is the info I have on the circuit. E=40v, R1=5ohms, R2=10ohms, R3= Infinate ohms. I see the answer in the back of the book, but I don't know how they got it. I'm solving for E Total, I Total, R Total, and P Total. I'm guessing that infinate resistance means there is a short? Thanks, Gary 
#2




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#3




Thanks,
But I'm still curious, because in the answer section of my workbook, it shows Total I=0 amps, meaning that R3 in effect neutralized R1 and R2. So, does this look accurate? ET = 40v IT = 0A RT = 00 ohms PT = 0 watts What does "fail open" mean? I found that on this site, Vol 1, Chapter 5/7. It implies that a resistor might "fail open", increasing it to near infinate levels. Thanks, Gary Last edited by Gdrumm; 02092009 at 10:05 PM. 
#4




If the resistors are connected in series then no current will flow due to the infinite resistance (open circuit).
if the resistors are connected in parallel then current will flow only through R1 and R2.
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#5




"fail open" means resistor has been destroyed. It has failed.
In this case, "fail open", it does not pass any current anymore. It is a dead resistor. Don't try to return it to the store where you bought it. See "Monty Python Dead Parot Sketch". http://www.youtube.com/watch?v=e6Lq771TVm4 
#6




I=E/R, so as R increases, I diminishes. As R increases without bound, I approaches zero. Once R is a few zillion yottaOhms, I is a few zillionths of a yoctoAmpere.
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#7




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Lets not confuse. Brian 
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infinate, infinite, resistance 
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