Find the Thevenin's Equivalence of a Circuit

[haha1234]

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 R_th,and the R_th is 20ohm.

But I had difficulty in finding the V_th.
In the first step I redrew the circuit in the following way.
And I set a equation to find that.
4-V_th/10=0
And V_th 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

 

[ehild]

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 R_th,and the R_th is 20ohm.

But I had difficulty in finding the V_th.
In the first step I redrew the circuit in the following way.
And I set a equation to find that.
4-V_th/10=0
And V_th 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.