Ok, I have modified my question again about the same circuit seen below: enter image description here

I have to simplify the circuit using source transformation and then find the current ix.

enter image description here enter image description here

I have attached my attempted solutions but I do not get the correct answer of ix = 0.9A ( I am getting 4.3 amps now).

What I suppose I would like to know is:

Is my circuit simplification correct or have I made a mistake somewhere?

Or could I have solved the current ix easily from any of the earlier steps I made in my circuit simplification? i.e. when would you guys stop performing source transformation and circuit simplification and start with circuit analysis to solve the current ix?



1) The far right is a voltage source with series resistance - it can be transformed, then combined with 9A. Then you can transform back into voltage.

2) Now you have only a single loop equation.

  • \$\begingroup\$ I have modified my original post with a new question if you would like to see it. \$\endgroup\$ – David777 Oct 16 '18 at 20:02
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    \$\begingroup\$ From the first (hand drawn) circuit to the second, make sure you keep track of where ix is defined... \$\endgroup\$ – Selvek Oct 16 '18 at 22:09
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    \$\begingroup\$ Nope. At the top, you have i_total = ix+9A. At the bottom, you have i_total = ix. \$\endgroup\$ – Selvek Oct 16 '18 at 22:23
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    \$\begingroup\$ Yes, 0.9A is correct (confirmed in LTspice) \$\endgroup\$ – Selvek Oct 17 '18 at 19:11
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    \$\begingroup\$ @David777 Your ix-9 should be ix+9 \$\endgroup\$ – Selvek Oct 21 '18 at 19:29

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