Find the Thevenin's Equivalence of a Circuit

In summary, the conversation was about finding the Thevenin's equivalence of a circuit and the difficulties encountered in finding the voltage and current values. The person was able to find the Thevenin resistance but had difficulty finding the Thevenin voltage. They redrew the circuit and set up an equation to find the Thevenin voltage, which was determined to be 40V. However, there was a discrepancy in the current value calculated for the 5 ohm resistor. The person asked for confirmation on their calculations.
  • #1
haha1234
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0
moved into homework foum so template headers are missing
I don't know how to find the thevenin's equivalence of a circuit.
In this question,it is required to find the thevenin's equivalence of the circuit.

Firstly,I found the Rth,and the Rth is 20ohm.

But I had difficulty in finding the Vth.
In the first step I redrew the circuit in the following way.
And I set a equation to find that.
4-Vth/10=0
And Vth is 40V.
So finally the current going through 5ohm resistant is 1.6.
But the current going though is 2.4 in fact.
Have I made any mistakes in my calculation?
Thanks
 

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  • #2
haha1234 said:
I don't know how to find the thevenin's equivalence of a circuit.
In this question,it is required to find the thevenin's equivalence of the circuit.

Firstly,I found the Rth,and the Rth is 20ohm.

But I had difficulty in finding the Vth.
In the first step I redrew the circuit in the following way.
And I set a equation to find that.
4-Vth/10=0
And Vth is 40V.
So finally the current going through 5ohm resistant is 1.6.
But the current going though is 2.4 in fact.
Have I made any mistakes in my calculation?
Thanks
This is homework. You should have sent it to the Homework section.
Your solution (Thevenin parameters, current through the 5 ohm resistor)
is correct.
How did you get 2.4 A? It is wrong.
 

1. What is Thevenin's Theorem?

Thevenin's Theorem states that any linear circuit can be represented by an equivalent circuit containing a single voltage source and a series resistor. This equivalent circuit is known as the Thevenin's Equivalent Circuit.

2. Why is it important to find the Thevenin's Equivalence of a circuit?

Thevenin's Equivalent Circuit simplifies complex circuits, making it easier to analyze and design circuits. It also helps in predicting the behavior of the circuit under different conditions, without having to solve the entire circuit every time.

3. How do I find the Thevenin's Equivalence of a circuit?

To find the Thevenin's Equivalence of a circuit, first, remove the load resistor from the original circuit. Then, calculate the open-circuit voltage (Voc) and the internal resistance (Rth) of the original circuit. Finally, construct the Thevenin's Equivalent Circuit using Voc as the voltage source and Rth as the series resistor.

4. Can Thevenin's Theorem be applied to non-linear circuits?

No, Thevenin's Theorem can only be applied to linear circuits, which follow the principle of superposition. Non-linear circuits do not follow this principle, hence cannot be represented by an equivalent circuit with a single voltage source and a series resistor.

5. What are the advantages of using Thevenin's Theorem?

Thevenin's Theorem simplifies circuit analysis and design, reduces the number of calculations required, and helps in predicting the behavior of the circuit under different conditions. It also makes it easier to troubleshoot and modify circuits, as changes in the original circuit can be reflected in the Thevenin's Equivalent Circuit.

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