How Do You Calculate Current I3 in This Complex Circuit?

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SUMMARY

The discussion focuses on calculating the current I3 in a complex circuit involving five resistors (R1 = 12 Ω, R2 = 78 Ω, R3 = 30 Ω, R4 = 69 Ω, R5 = 72 Ω) and a voltage source (V = 66 V). The key equations used are Ohm's Law (V = iR) and the formula for total resistance in parallel circuits (1/Rtotal = 1/R1 + 1/R2 + ...). The participants express confusion regarding the impact of the additional connection between R1 and R2 on the circuit's configuration, complicating the identification of series and parallel arrangements.

PREREQUISITES
  • Understanding of Ohm's Law (V = iR)
  • Knowledge of series and parallel resistor configurations
  • Familiarity with calculating total resistance in circuits
  • Basic circuit analysis skills
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  • Practice calculating equivalent resistance with complex resistor networks
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Students in electrical engineering, hobbyists learning circuit design, and anyone seeking to improve their circuit analysis skills will benefit from this discussion.

Mikesgto
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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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