Norton Resistor reduction

[javier]

Hello, Just need to know if I can reduce 4 and 6 parallel, 12 and 8 parallel and then add the results in series, I got confused due to the voltage source shorted, I really appreciate your support.

[javier]

I'm getting 4//6= 2.4 and then 12//8= 4.8, adding 2.4 and 4.8 in series RN= 7.2, someone that confirm this? suggestion?

[javier]

Just finished the exercise, I need to do the Maximum Power Transference Theorem, I get to the results, my final RN=7.2, using Mesh and doing a short circuit to the RN I concluded 3 currents: I1=3.93, I2=0.87 and I3=1.56 being I3=IN so I used the Maximum Powe formula which is Pmax=(IN)^2 * RN / 4 and gave me Pmax= 4.38 Watts, if someone find something done incorrectly please let me know, I'm always open to constructive criticism.

[arhanghel]

I redrawn the circuit for you to understand better (my skills in paint are not so good ).

i42.tinypic.com/2lxtuhh.jpg

So, 4//6 and 12//8 and then 4//6 series whit 12//8.

[javier]

Thank you very much! =)