Hi all,

I have some problems regarding total resistance and Thevenin.

Problem 1:

In the first attachment, is the 2ohms in parallel with the 6ohms, total in parallel
with the 8ohms and the total in series with the 10ohms ??

Problem 2:

In the other attachments I am trying to find I load using Thevenin theorem, but the current is not matching with the correct answer. Does anyone know what am i doing wrong?

Please help.
Thanks in advance and sorry for my poor English.

 

Problem 1:

2Ω resistor is short by the wire.

Problem 2

I got the same answer as you

 

Thanks for the reply.

2Ω resistor is short by the wire.

Does that mean that i have to ignore the 2 ohms (i.e. 6 in parallel with 8, result in series with 10 ??

 

Thanks for the reply.



Does that mean that i have to ignore the 2 ohms (i.e. 6 in parallel with 8, result in series with 10 ??

Yes, exactly you shoudl ignore 2Ω resistor.
And as you said Rtot is equal Rtot = 10Ω + 6Ω||8Ω

 

Hi again,

I have the attached circuit with parallel and series resistors. Are they as follow:

12//18 --- result//10 ---- result2//22 ---- result3 + 15 ??

 

And in this circuit are the 22 + 15 .... result//18 .... result2 + 12 + 10 ???

PLEASE HELP.

 

Resistance seen from this current source terminal is equal to
Rtot = ((22+15)||18) + 12 + 10 = 34.109R

And resistance seen from 48V voltage source terminal is equal to

Rtot = 22 + 18 + 15

 

Thanks for the reply

And resistance seen from 48V voltage source terminal is equal to

Rtot = 22 + 18 + 15

And what happen with the 12 and 10 resistors please?

 

The 48V source current can flow only in closed loop. So how can he flow via 12 and 10 where we have a open circuit?

 

Ok. Thanks for your fast reply

 

Hi again,
can someone tell me how to work the total resistance of the attached circuit please ?

 

If I work it as below, is it correct?

((R1//R2)//R3) + (R4//R5)

 

Well, between which terminals you want to find this total resistance?
Also you can always use delta-wye transformation.

 

Hi Jony130,

I want to find the total resistance from the terminals of the load resistor which is marked in red in the picture attached below. I removed the load resistor since i meed to find the current on each resistor using Thevenin theorem (so I think I cannot use delta to star transformation)

Thanks in advance.

 

If so I think that Rtot = R3||(R1||R4 + R2||R5)