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Homework Statement
Find the equivalent resistance R_{ab} for each circuit given here (resistance values have been omitted so I can focus on understanding the concept, but I can supply them if requested).
Homework Equations
This problem expects me to know how to combine resistors in series/parallel.
Series: R_{eq} = R1 + R2 + ... + R_{k}
Parallel: R_{eq}^{1} = R1^{1} + R2^{1} + ... + R_{k}^{1}
The Attempt at a Solution
Attempt for circuit 1:
 Combine R1 and R2 in parallel.
 Combine R3 and above R_{eq} in parallel.
 Combine R4 and above R_{eq} in series.
 Combine R5 and above R_{eq} in parallel.
 Combine R6 and above R_{eq} in series.
Attempt for circuit 2:
Here is where I had a lot of trouble. The conductor at the right end of the circuit is what's throwing me off. I reconstructed this circuit in a simulator and it was showing that the voltage across R1 is 0, but I'm not sure why. Also, I don't know how to start combining them. R2 and R3 aren't in parallel (at least, I don't think they are), and I don't think R1, R2, and R3 are in series since the current across R1 would be different than the current across R2 and R3. Any push in the right direction would be greatly appreciated!
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