# mesh analysis with 3 loops

Discussion in 'Homework Help' started by shuujin01, Dec 3, 2013.

1. ### shuujin01 Thread Starter New Member

Nov 30, 2013
16
0
Hi can anyone please check my loop equations to see if i did them correctly that's all i need help with.
mesh1:
E1 = Vr +E2+Vc+E3
E1-E2-E3 = r(i1+i2)+c(i1+i3)

E1-E2-E3 = i1(r+c)+ i2(r) +i3(c)
mesh 2:
-E2 = Vr+Vz1+Vz2
-E2 = r(i2+i1)+z1(i2)+z2(i2+i3)

-E2 = i1(r)+i2(r+z1+z2)+ i3(z2)
mesh 3:
E3 = Vc+Vz2+Vz3
E3 = c(i3+i1)+z2(i3+i2)+z3(i3)

E3 = i1(c)+i2(z2)+i3(c+z2+z3)

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2. ### WBahn Moderator

Mar 31, 2012
20,064
5,665
You need to develop the ability to check your own work. After all, who's going to check it for you in the real world? If the person that hired you knew the answer, they wouldn't have hired you! Being able to solve problems -- and verify that they have been solved correctly -- is the value you bring to the table and for which people are willing to pay you a decent wage.

The nice thing about most engineering problems is that you can determine the validity of a solution starting from the solution itself.

Now, remember what I said about not making your audience GUESS at what you mean?

You have E1, E2, and E3. What are those? There is nothing in the diagram by any of those names? Do you mean v1, v2, and v3? If so, say so!

Then you have Vr and Vc and the rest of the voltages? What is the polarity of each of them. I am NOT going to try to reverse engineer which polarity you assigned to them. If I were grading this, why should it be worth my time and effort to figure out something that you obviously felt wasn't worth your time to indicate?

3. ### shuujin01 Thread Starter New Member

Nov 30, 2013
16
0
then never mind checking it. i am just gonna delete this thread. thanks for the big help

4. ### The Electrician AAC Fanatic!

Oct 9, 2007
2,368
353
You can lead a horse to water, but you can't make him drink.

'Twas ever thus.

5. ### shuujin01 Thread Starter New Member

Nov 30, 2013
16
0
indeed i cant make the horse drink, the horse has to be thirsty for him drink, right the Electrician. anyway thanks for ur time to check my thread and spend some time to respond. big help i appreciate it.

6. ### WBahn Moderator

Mar 31, 2012
20,064
5,665
1) You can't delete the thread.