are the two circuits equvalent ? I have actually got a different problem (wheatstone bridge) but,I want to make sure that there is no mistake in my assumption before asking that question. In the circuit R1,R2,R3,R4 are resistance. 'i' represents the current flowing through the mid wire.
closed as off-topic by ACuriousMind♦ Dec 27 '18 at 17:49
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Indeed they are equivalent. You can see this by joining the 'inner' ends of the four resistors together by connecting them to a single 'point' junction rather than using the wires you've labelled "i". Incidentally the currents you've labelled "i" in your two diagrams aren't generally the same.