Homework Help: Electric circuit analysis problem help?

1. Apr 13, 2013

Questions999

We have the circuit that I have attached in the figure.I have to find i1 i2 and V.
SO I firt find i1.
I find the equivalent resistance ( I am not writing it all here because it takes too long) and Re=10 Ohm.So i1 =V/Re=10 A.
I thought that to find i2 and V I had to use the current division principle and tension division principle hence :
V=[2/(4+2)]*100 V
and i2=[4/(4+24)]*10 A... what am I doing wrong?

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2. Apr 13, 2013

CWatters

Thats wrong. The 2/(4+2) is the right idea but the voltage at the top of the 12 Ohm resistor isn't 100v. There are several potential dividers in a row. You have skipped a few.

First you have to work out the voltage at the top of the 24 Ohm resistor. From your earlier working out of Ii you will know that the Re at that point is 6 Ohms. eg...

(((2+4)//12)+4)//24 = 6

So the voltage on the 24Ohm is...

100 * 6/(6+4) = 60V

Repeat the process to find the voltage on the 12 Ohm Resistor.

Then repeat the process again to find the voltage on the 2 Ohm Resistor.

3. Apr 13, 2013

CWatters

Once you have calculated the voltage on the 24 ohm resistor the current i2 is easy.

4. Apr 13, 2013

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