Hello, I need some help with a Sadiku's 5th edition exercise.

The exercise asked v(t) and i(t) for t>0.

I didn't understand why the current source became a voltage source with 30 V.

 

Try read this
https://www.allaboutcircuits.com/technical-articles/source-transformation/

 

Try read this
https://www.allaboutcircuits.com/technical-articles/source-transformation/

I read it, but I didn't understand the 30 V voltage source and the 10 ohm resistor.

 

I read it, but I didn't understand the 30 V voltage source and the 10 ohm resistor.

It just an error on the diagram. It shoud be 5Ω, 1Ω and 2Ω as we can see in the alpha equation.

 

It just an error on the diagram. It shoud be 5Ω, 1Ω and 2Ω as we can see in the alpha equation.

So, for t<0 , V(0)= 20 V is also wrong, the correct is V(0)= 40 V?

Thank you very much.

 

So, for t<0 , V(0)= 20 V is also wrong, the correct is V(0)= 40 V?

Yes.