Have the Currents Been Labelled Correctly?

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SUMMARY

The discussion centers on analyzing a circuit using Kirchhoff's Laws and Ohm's Law to determine the correct labeling of currents. The user initially calculated the current i2 as 11/6 A, while the textbook provided an answer of 13/6 A. After further analysis, the user confirmed that the voltage drop across the 6Ω resistor is indeed 11V, validating their calculation of i2 as 11/6 A. This indicates that the textbook may contain errors in its solutions.

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Homework Statement



Linked below is a rough picture of the circuit for which I need to find the currents.

https://docs.google.com/drawings/pub?id=1jY6r1yjOf9OG5VixjZKcQbG2rj-ZQ7LZzaybGzkjva0&w=960&h=720

Homework Equations



Kichhoff's Laws, Ohm's Law.

The Attempt at a Solution



I'm doing a self-study using a book that I think may be riddled with errata, so I keep finding that I'm getting a result which disagrees with the answer the back and cannot see why my answer differs. I get the system of equations

[itex]11 - 3i_{3} + 1 = 0[/itex]

[itex]11 + 6i_{2} = 0[/itex]

[itex]-3i_{3} + 1 -6i_{2} = 0[/itex]

[itex]i_{3}=i_{1}+i_{2}[/itex]

I believe my choice of direction of flow is consistent and cannot affect my solution up to a change of sign. The book produces the result that [itex]i_{2}=13/6[/itex] when I obtain 11/6.
 
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Addem said:

Homework Statement



Linked below is a rough picture of the circuit for which I need to find the currents.

https://docs.google.com/drawings/pub?id=1jY6r1yjOf9OG5VixjZKcQbG2rj-ZQ7LZzaybGzkjva0&w=960&h=720

Homework Equations



Kichhoff's Laws, Ohm's Law.

The Attempt at a Solution



I'm doing a self-study using a book that I think may be riddled with errata, so I keep finding that I'm getting a result which disagrees with the answer the back and cannot see why my answer differs. I get the system of equations

[itex]11 - 3i_{3} + 1 = 0[/itex]

[itex]11 + 6i_{2} = 0[/itex]

[itex]-3i_{3} + 1 -6i_{2} = 0[/itex]

[itex]i_{3}=i_{1}+i_{2}[/itex]

I believe my choice of direction of flow is consistent and cannot affect my solution up to a change of sign. The book produces the result that [itex]i_{2}=13/6[/itex] when I obtain 11/6.
attachment.php?attachmentid=49266&stc=1&d=1342999707.png

Added in Edit:

If i2 = 11/6 A, then the voltage drop across the 6Ω resistor is 11 V, which makes perfect sense. So, it looks like you are correct !
 

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Last edited:
I agree. The voltage across the 6 ohm resistor is fixed at 11V so the current is simply 11/6 amps.

Have they/you labelled the currents correctly?
 

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