Find the equivalent resistance seen by the source

AI Thread Summary
The discussion centers on finding the equivalent resistance in a circuit, with participants initially debating whether the correct value is 6Ω or 8Ω. The consensus among some users is that the equivalent resistance is indeed 6Ω, contradicting the claim that it should be 8Ω. Participants express confusion over the calculations and the arrangement of resistors in the circuit. The conversation highlights the importance of correctly applying Kirchhoff's and Ohm's laws to solve for equivalent resistance. Ultimately, the group acknowledges that miscalculations can occur, leading to differing answers.
scanferr
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Homework Statement



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


Homework Equations



Kirchoff's laws and Ohm's laws

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 parallel of those with the rest? I don't get why I got it wrong.

Can you people help me?
 
Last edited by a moderator:
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scanferr said:

Homework Statement



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

Homework Equations



Kirchoff's laws and Ohm's laws

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 parallel of those with the rest? I don't get why I got it wrong.

Can you people help me?
Hello scanferr. Welcome to PF !

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

Show how you got your answer.

Added in Edit:

Actually, I also get 6Ω .

I don't know why I initially wrote 8Ω .
 
Last edited by a moderator:
I got 6 ohm as my answer !
 
6 ohms here, too. How can we all be using the same buggy calculator? :wink:
 
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.
 
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!
 

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