# Thevenin equivalent (symbolic circuit calculation)

## Homework Statement

I have trouble to find the right procedure to transform the circuit below to a thevenin equivalent.
I am looking for a symbolic solution a step by step guidance of where to start and how to add/locate all the impedance in series and parallel in order to calculate the sum of Z seen from point A and B  ## The Attempt at a Solution

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I have a hard time see which impedance are in series and parallel, as Z5, Z4 and Z3 forms a star connection to GND? Would the solution be to make a form of star/delta transformation of the circuit in order to calculate the circuit?

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Last edited:

phinds
Gold Member
2021 Award
You have to define the nodes between which you want the Thevenin equivalent. Without that your question has no answer.

Also, we don't DO "step by step" instructions. YOU do a step by step analysis and tell us when you get stuck.

You have to define the nodes between which you want the Thevenin equivalent. Without that your question has no answer.

Also, we don't DO "step by step" instructions. YOU do a step by step analysis and tell us when you get stuck.

My post have been updated with nodes A and B

phinds
Gold Member
2021 Award
My post have been updated with nodes A and B
Then a first step of getting the Thevenin Equivalent voltage should be REALLY easy. What is it?

Then a first step of getting the Thevenin Equivalent voltage should be REALLY easy. What is it?
If i know the voltage but need to find the sum of impedances in order to calculate the current

phinds
Gold Member
2021 Award
If i know the voltage but need to find the sum of impedances in order to calculate the current
You did not answer my question.

gneill
Mentor
If i know the voltage but need to find the sum of impedances in order to calculate the current
You can find the current by using standard circuit analysis methods: basic KVL & KCL, Nodal Analysis, Mesh analysis... Take your pick.

Edit: Or, as you've stated, you could use a star-delta transform to begin reduction of the resistor network.

You did not answer my question.
Sorry I did not quite get what you are asking for?

phinds