# Quiz question - Thevenin and Norton Circuits.

Discussion in 'Homework Help' started by J.live, Oct 12, 2010.

1. ### J.live Thread Starter Member

Sep 10, 2010
35
0
Which of it is true

Edit
I am not sure how to do this one.

15 ll 10 = 6

10 ll 10 = 5

RL= 11 ? I know this is wrong.

Va = 30 x ( 10 / 10 +5 )= 2

Va' = 30 x ( 10 / 10 +10 )= ?

I am having trouble splitting the RL and Vth

I am totally lost on this one.

P.S sorry for not showing work before .

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Last edited: Oct 12, 2010
2. ### ELECTRONERD Senior Member

May 26, 2009
1,146
16
What do you mean which of it is true? Is there a question that came with the problem? Provide your work first, before you expect us to do it for you.

3. ### J.live Thread Starter Member

Sep 10, 2010
35
0
Yeah, reposted the question.

Last edited: Oct 12, 2010
4. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
The circuit doesn't give you enough information to calculate $R_L$ and it doesn't want you to either.

You need to convert the circuit to its Thevenin equivalent. Read here for info: http://www.allaboutcircuits.com/vol_1/chpt_10/8.html

What you also need to know is that in order to have maximum power transfer, the $R_{th}$ must be equal to $R_L$.

5. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,402
1,223

Attached is one way ....

After you do the calculations, test each answer till you find which one is true, if any.

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