I am currently working on a physics homework problem that is giving me some trouble. The problem involves circuit analysis. Here it is:(adsbygoogle = window.adsbygoogle || []).push({});

How much current flows through the bottom wire shown below, and in which direction?

(http://www.cramster.com/answers-jul...nt-flows-bottom-wire-inthe-figure_286422.aspx)

The answer in the book says "2.1 A, Left to Right". I cannot see how the book came up with that solution.

I made several attempts to solve the problem but the biggest issue I am struggling with is conceptual. If I can understand which way the current moves through the circuit then I think I can determine how much current moves through the bottom wire. I think that the current moves through two loops as follows:

Upward from the 15V battery through the 10 Ohm resistor

Downward through the 12 Ohm and 24 Ohm resistors

From the 24 Ohm resistor back to the 15V battery and from the 12 Ohm resistor to the 9V battery

Upward from the 9V battery through the 6 Ohm resistor

Downward through the 12 Ohm and 24 Ohm resistor

From the 24 Ohm resistor back to the 15V battery and from the 12 Ohm resistor to the 9V battery

Can somebody somebody let me know if I am making any major mistakes in my assumption of the current movements? Thanks for your help!

(I apologize for posting this question in the Classical Physics Forum instead of the Homework Questions Forum. I am not quite sure how to move it.)

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# Homework Help: Electrical Circuit Analysis

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