Recent content by brabbit87

Can't really see the equation as I'm on the phone app. But you know the current from the mesh analysis. So you can compare and tinker.

Like gneil had said to me previous to now. I had mixed my directions up going into the supernode. I drew current arrows into the supernode and did the 4 equations based on that. And simplified. Bearing in mind you need an initial equation for v30 to substitute into it. Hope it helps

Thanks for the help, for some reason. the spreadsheet given to me just is not calculating the mesh currents. i have tried an internet calculator and it calculates it just fine.

I have redrawn the polarity of impedances and voltage sources in the attached image. Mesh 1 - v1 - (z1)(I1) - (z4)(i1 - i2) = 0 v1 - (2)(i1) + (5j)(i1) -(5j)i2 = 0 120 = (2 - 5j)i1 + (5j)i2 Mesh 2 -v3 - (z5)(i2 - i3) - (z4)(i2 - i1) -v3 -(4j)(i2) +(4j)(i3) +(5j)(i2) - (5j)(i1) -v3 =...

V3 will cause a potential drop due to assumed current (clockwise) and it passing from + to - on the source.

No, really. I am genuinely not looking for that. I am just struggling with this question.

My initial equation for the mesh 2, is that correct? Regards

I apologise gneill, however i am still unsure. Is it just the 2nd mesh equation that i have incorrectly done?

I have defined which way my current goes in each mesh, clockwise. Or are referring to something else. I may have possibly missed? Apologies if i am being stupid with something

I'm not so sure. What is wrong with v3 in my mesh 2 equation. Assuming clockwise current of circuit. It would be a negative voltage with positive voltage drops across the impedances?

All finished nodal analysis and answer is correct. Had another attempt at the mesh analysis, unfortunately the matrix spreadsheet will not calculate I1,2,3. I am lost here, i have repeated the same 3 equations. KVL walk clockwise around the 3 loops Mesh 1 - v1 - (z1)i1 - (z4)(i1 - i2) = 0 v1...

Thankou. Maybe being abit too careless. Will make another attempt.

im struggling abit with the nodal analysis. i think i have simplified the equation appropriately. Equation with substitution for v30: ( v10 - v20/ z1)) + ( v20/ z4) + ( v20 - v3 / z5) + (v2 - v20 + v3/ z3) = 0 i have split the fractions to start isolating v20(v1 / z1) - (v20 / z1) +...

Thanks for the response. My figures are improved.

sorry I am not sure i follow. is there a reason i should pick V1 over V2 as the phase reference.