# Thevenin Equivalent in AC circuit

Discussion in 'Homework Help' started by jboavida, Nov 19, 2008.

1. ### jboavida Thread Starter Member

Jul 10, 2008
23
0
Hi All,

My name is Joaquim and I'm new in this forums. I am a Electronic Engineer student (1st Year).

I have a question about a Thevenin equivalent circuit in AC.

I need someone to tell me if I'm doing the right math in finding the thevenin equivalent (AB point):

I need to calculate the inductor reactance
(Xl) = 2 * Pi * F * L
The capacitor reactance
(Xc) = 1 / ( 2 * Pi * F * C )

And then I add R1 to L1 reactance and parallel with C1 reactance.
Finally, the result added to R2.

((R1+XL1) // XC1)+R2 = ZThevenin

Are my calculations correct or I'm missing something?

Joaquim

• ###### Cir1.bmp
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Last edited: Nov 19, 2008
2. ### mik3 Senior Member

Feb 4, 2008
4,846
69
Where is the circuit?

3. ### jboavida Thread Starter Member

Jul 10, 2008
23
0
Attached now. Bad url. Sorry & Thanks

Joaquim

4. ### mik3 Senior Member

Feb 4, 2008
4,846
69
You are right.

5. ### hgmjr Retired Moderator

Jan 28, 2005
9,030
218
Looks right to me also.

For the sake of completeness, I imagine that your instructor intended for you to complete the calculation. Then you would be able to use the given frequency of the AC voltage source to compute the actual value of Zth.

hgmjr

Last edited: Nov 20, 2008