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[SOLVED] [Moved]: finding phase shift and magnitude of an RL circuit

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Jo3ster7

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Hello everyone,

I am a newby at electronics and i am doing a homework, i am stuck and can not find the answer for the following problem:

"Refer to the RL circuit of Figure 9.36. If 1 V is applied, find the magnitude and the phase shift produced at 5 kHz. Specify whether the displacement from phase go foward or backward"

In the attached doc file is what i have made until now viewing videos and some books, please, i really need some help with this i am out of choices.

Regards, Jhon.
 

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  • myanalysis.doc
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  • circuit.png
    circuit.png
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Re: Need someone that help me finding phase shift and magnitude of an RL circuit

I don't see anything particularly wrong with your solution. I did not check the math but the method looks ok. Why do you think it is not right?
 

Re: Need someone that help me finding phase shift and magnitude of an RL circuit

aryajur said:
I don't see anything particularly wrong with your solution. I did not check the math but the method looks ok. Why do you think it is not right?
Click to expand...

I do not know what else i need to do from this point, some people told me that i need to find Vo/Vi in order to find the phase shift and the magnitude but i don't know how to do it. i was following the problem that appears on the book (i attached the page of it), but if i do the same procedure on the practice exercise 9.14 which is almost equals that the one i am working (the H value of L1 and L2 change) i can not get the same result that the book said. so in some point i am missing something and i do not know what to do.

Thanks in advance,
 

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  • WorkBook.pdf
    72.1 KB · Views: 155

I solved the problem in a little bit different way (I didn't read the procedure explained in the book, before).
I hope it could help.

MagPhase1.jpg
MagPhase2.jpg
 
Awesome!, it is very detailed, thank you very much, I only have one question, I am trying to use the same given formulas for practice problem 9.14 in the attached pdf, and the results are not the same given by the same book, do you know the reason of this?
 

So here is my solution for both your problem and the book problem. The difference from your solution is that you end up finding the Magnitude and phase of Zin. You just need to use your Zin to find Vo and find its Magnitude and Phase.
 

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  • New Doc 2017-11-08.pdf
    297.7 KB · Views: 147
thank you aryajur, your explanation solve my doubt about the workbook problem, both of the explanations give me the tools to learn how to solve these problems, i am really bad with these things, sometimes just reading i can find the answer but this time was impossible.

Thank you again!.

Regards, Jhon.
 

arayjur, you've lost a minus sign somewhere. You have the phase angle of Vo/Vi as positive, but in both problems it is negative. albbg got the sign right.
 

The Electrician said:
arayjur, you've lost a minus sign somewhere. You have the phase angle of Vo/Vi as positive, but in both problems it is negative. albbg got the sign right.
Click to expand...

Actually if you look closely at my derivation the sign of my phase is the same what albbg got. Since after I get theta it has to be placed in the equation which defines Vo/Vi which has a minus sign in the theta.
 

aryajur said:
Actually if you look closely at my derivation the sign of my phase is the same what albbg got. Since after I get theta it has to be placed in the equation which defines Vo/Vi which has a minus sign in the theta.
Click to expand...

And since you didn't do that your solution is incomplete; minus 10 points. :wink:

By the way, you and albbg didn't follow the usual philosophy when helping with homework. You just handed the OP complete solutions rather than guiding him step by step to a solution, with him doing most of the work.
 

The Electrician said:
By the way, you and albbg didn't follow the usual philosophy when helping with homework. You just handed the OP complete solutions rather than guiding him step by step to a solution, with him doing most of the work.
Click to expand...

You are right! Well I wasn't the 1st one :razz: so I thought maybe it will be helpful for him to see other ways as well.
 

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