Help with this problem - finding power transfer to R load

[akatsuki_93]

help with this problem -- finding power transfer to R load :)

http://img99.imageshack.us/img99/610/08072012060.jpg

i want help with finding Vth and finding power transfer to R load

thanks all

 

[lewando]

Rules require you to do some work first. What have you tried? Where are you getting stuck? What does the blanked out text say?

 

[akatsuki_93]

sorry about the rules
I found Rth but the major problem is finding Vth i don't know from where to start so i need some hints or tips because i am new in these things :)
lets back to Rth i don't if it correct 100% but the value i found is 28/9

( about blanked --- determine the Rth and Vth ---)

sorry again about the rules

 

[lewando]

Here is a good reference:
faraday.ee.emu.edu.tr/eeng223/lecture_notes/Thevenin - Norton Equivalents and Maximum power transferx4.pdf

 

[akatsuki_93]

thanks for your help

Voc which is = Vth i found it hard to find so I found Isc then Vth =Rth*Isc and i get this 28/9k * 971/140m = 21.6 V