Very simply circuits question

Thread Starter

de1337ed

Joined Mar 6, 2011
23
I haven't taken circuits in a very long time, and now I have to take this course. I just have a quick question about a small circuit:


I was just wondering if Resistors R1 and R2 have been shorted out and don't have any affect on the circuit. I'm trying to find the resistance that's seen through the voltage source... And from what I understand, it should only be R3 because R1 and R2 have been shorted... Is this correct?
Thank you
 

Wendy

Joined Mar 24, 2008
21,840
They are out of the circuit, they might as well not exist.

High frequencies are trickier, but I'm assuming basic DC electronics.
 

PNeil

Joined Oct 27, 2010
11
You are correct.

R1 and R2 are shorted out of the circuit and thus bypassed. Only if you break the circuit at the upper left hand corner will R1 and R2 be in the circuit and thus be in series with R3.

No current flows through R1 and R2 so they have no effect on the circuit.
 
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