Circuit Analysis - Source Transformation

[jisbon]

Homework Statement

Analyze using the hints given.

Relevant Equations

-

My work seems to be wrong somehow since my answer is wrong, and I need your help to find out which part is going wrong for me :/

My work:

1.

2.

3.

4.

5.

6.

(10/7)/(10/7+7) = 0.7627A, which is not the answer.

May I consult where is the problem in solution? THanks

 

[DaveE]

OK up to step 5. Look at the current sources again.

 

[jisbon]

As in

OK up to step 5. Look at the current sources again.

As in there's a problem with step 5? Shouldn't I combine the resistors in parallel?

 

[DaveE]

OK step 4 then. Think about how you combine two current sources into 1. Once you have a network where everything is in parallel, you are free to redraw your schematic with any ordering of the components that you like. It may help if you draw it with all of the current sources together and then simplify.

 

[ehild]

Homework Statement:: Analyze using the hints given.
Relevant Equations:: -

My work seems to be wrong somehow since my answer is wrong, and I need your help to find out which part is going wrong for me :/
My work:

1.

2.

3.

4.
View attachment 260284
5.
View attachment 260285
6.
(10/7)/(10/7+7) = 0.7627A, which is not the answer.

May I consult where is the problem in solution? THanks

why did you subtract the currents supplied by the two sources?

 

[jisbon]

why did you subtract the currents supplied by the two sources?

Because they were going in different directions? Am I supposed to add theminstead?

 

[ehild]

Because they were going in different directions? Am I supposed to add theminstead?

Replace the three parallel resistors with their resultant- In what
direction do the currents flow through this resistor?

 

[jisbon]

Oh, they re going in the same direction ..:/

 

[DaveE]

Oh, they re going in the same direction ..:/

Yes! They both feed current into the same circuit node, so they add when combined into one source.