# Homework Help: Where did I go wrong while solving for R_L?

1. Jul 5, 2011

### PainterGuy

Hi,

I was finding the value R_L for which maximum power takes place. Maximum power takes place when R_L = R_Th. Please have a look on the following link; you can see my answer is different: http://img215.imageshack.us/img215/7743/imgtb.jpg

2. Jul 5, 2011

### Staff: Mentor

Your loop 1 equation looks to be incorrect. I see -9I1 rather than -7I1.

3. Jul 5, 2011

### PainterGuy

Thanks a lot, gneill. You are correct. I have made an error.

Regards,

4. Jul 6, 2011

### PainterGuy

Hi again, gneill

1: I have also used nodal analysis to solve the problem. Please have a look here: http://img838.imageshack.us/img838/1970/prob1x.jpg

2: I have tried nortonized the circuit and tried to find I_N using I_sc. Please have a look here: http://img39.imageshack.us/img39/3187/prob2s.jpg

My answer is not correct as you can see. The V_Th and R_th found previously in previous posts produce different value for I_N than the one found using I_sc. What did go wrong?