Hi all, I have recently enrolled in an Electrical engineering course in a university after 2 years of mandatory military service. In that period of time, my brain have gotten rusty and I have forgotten many of the mathematical and physic concepts taught in high school/college. To my horror, I find myself struggling with questions for hours while the China scholars around me can finish them in minutes. (They are also quite friendly, but when I asked them for them for help, I couldn't understand though their accent, and they just pointed here and there and wrote down some formulas which I couldn't understand.) I did seek help from tutors and the net and things got clearer, but I do have some uncertainties.

For example,

For the Mesh loop l2, seeing that the direction of the mesh current is counterclock wise, why isn't the equation of the mesh:

R2(l2+11) + R4(l2+l3)+R3(l2)=0

I do know both of their sums = 0 but why is the negative convention taken?

Could anyone also enlighten me on this question?

Here are the workings I did (spent many days brute forcing through)

I do have many more pages of workings (tried over many hours and days) but I hope these examples will be able to tell you what I am missing (in conceptual knowledge) =(

This is my final attempt to solve the problem.

As IL is obviously not near the value of 4.44A, (answer is 4.44 + 0.09), I have failed yet again...

Could you guys please help (and apologies if I posted in the wrong forum). I am spending thousands for this university education, and find myself depressed not to be able to understand anything at the start.

Thank you

For example,

For the Mesh loop l2, seeing that the direction of the mesh current is counterclock wise, why isn't the equation of the mesh:

R2(l2+11) + R4(l2+l3)+R3(l2)=0

I do know both of their sums = 0 but why is the negative convention taken?

Could anyone also enlighten me on this question?

Here are the workings I did (spent many days brute forcing through)

I do have many more pages of workings (tried over many hours and days) but I hope these examples will be able to tell you what I am missing (in conceptual knowledge) =(

This is my final attempt to solve the problem.

As IL is obviously not near the value of 4.44A, (answer is 4.44 + 0.09), I have failed yet again...

Could you guys please help (and apologies if I posted in the wrong forum). I am spending thousands for this university education, and find myself depressed not to be able to understand anything at the start.

Thank you

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