How Do You Calculate Current I3 in This Complex Circuit?

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To calculate the current I3 in the given circuit with specified resistor values and voltage, understanding the configuration of resistors is crucial. The additional connection between R1 and R2 complicates the identification of series and parallel arrangements. The forum participants express confusion regarding how to approach the circuit analysis without a visual representation. Key equations include Ohm's Law (V = iR) and the formula for total resistance in parallel circuits. Clarifying the circuit layout is essential for accurately determining the current I3.
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Homework Statement


In the circuit below find the current I3 (in A) when R1 = 12 Ω, R2 = 78 Ω, R3 = 30 Ω, R4= 69 Ω, R5 = 72 Ω, and V = 66 V.

[URL]https://s4.lite.msu.edu/res/msu/mmp/kap20/picts/hkirch2.gif[/URL]


Homework Equations


V=iR
1/Rtotal=(1/R1+1/R2...)


The Attempt at a Solution



I am thoroughly confused how to treat the resistors. What effect does the extra connection between R1 and R2 have on the diagram? It's making it hard to realize what's in series or what's in parallel.
 
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I don't see any diagram, so I don't know where to begin to help you.
 

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