Why Are the 5 and 20 Ohm Resistors in Parallel?

AI Thread Summary
The discussion focuses on understanding why the 5 and 20 ohm resistors are considered to be in parallel in a given circuit. The equivalent resistance can be calculated by recognizing that both pairs of resistors (5 and 20 ohm, 6 and 3 ohm) share the same voltage across them. The explanation involves tracing the current path from point A to B, highlighting that after the 10 ohm resistor, the current can flow through different paths while maintaining the same voltage. The final step involves considering the 8 ohm resistor in the overall circuit analysis. Understanding these connections is crucial for accurately determining the equivalent resistance.
princejan7
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I'm trying to find the equivalent resistance of this circuit but I don't know where to start.

The solution manual says that the 5 and 20 ohm resistors are in parallel as well as the 6 and 3 ohm resistors. Can someone explain why?
 

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Go from a to b: after 10 ohm you can turn up or down and end up at one and the same voltage (the wire that runs around to the left) Again you can go via 6 or 3 and the final hurdle is the 8 ohm.
Now draw the picture again, with a at the top and b at the bottom.
 
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