# Homework Help: Find the equivalent resistance seen by the source

1. Jun 25, 2012

### scanferr

1. The problem statement, all variables and given/known data

Find:

a) the equivalent resistor seen by the source;
b) value of i0;
c) value of v;
d) value of v0.

http://img823.imageshack.us/img823/4406/dasso.jpg [Broken]

2. Relevant equations

Kirchoff's laws and Ohm's laws

3. The attempt at a solution

To solve b,c,d I need to get a right which I didn't. I got 6Ω for the equivalent resistor and the right answer is 8Ω. I don't understand why!
Isn't the circuit made of those 36Ω and 44Ω in series and the 40Ω,10Ω,30Ω in series and the paralel of those with the rest? I don't get why I got it wrong.

Can you people help me?

Last edited by a moderator: May 6, 2017
2. Jun 25, 2012

### SammyS

Staff Emeritus
Hello scanferr. Welcome to PF !

[STRIKE]I also get 8Ω for the equivalent resistance.[/STRIKE]

Actually, I also get 6Ω .

I don't know why I initially wrote 8Ω .

Last edited by a moderator: May 6, 2017
3. Jun 25, 2012

I got 6 ohm as my answer !

4. Jun 25, 2012

### Staff: Mentor

6 ohms here, too. How can we all be using the same buggy calculator?

5. Jun 26, 2012

### vk6kro

I get 6 ohms too. 8 ohms is just wrong. It happens.

Anyway, you would then calculate the voltage between the top and bottom supply rails and calculate the currents through the parallel resistors and networks.

V = I * R. I = 8 amps. R = 6 ohms.

6. Jun 29, 2012

### scanferr

Thanks guys!

It seems the solution is wrong then. It happens yes, and I was kinda confused because I didn't know how 8ohms could be right!