Sunday 1 February 2015

resistors - Equivalent Resistance?



How do you find the equivalent resistance here?


How do you find the equivalent resistance here? (I realized it's a Wheatstone bridge, but it's unbalanced, so that doesn't help.) I tried using Kirchhoff's laws, but there is no cell given.




Answer



It looks like irreducible network - network which does not contain series or parallel connections that can be reduced.


You can add some voltage source to X and Y terminals and do mesh analysis.


It is explained in Wikipedia mesh analysis article, and also in this video by Darryl Morrel so I will not explain it here.


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