# Series-parallel circuit

1. Aug 22, 2010

### kai92

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

Can anybody help me solve this circuit?I wanna find V1, V2, V3, I1, I2, I3.Power supply is 40V.

2. Relevant equations

3. The attempt at a solution

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2. Aug 22, 2010

### city25

it's not very difficult to work with.

you may first find V2.

3. Aug 22, 2010

### kai92

Well,I don't know what to do at all.I hv found the total resistance,15.975 Ω ,and total current,2.504A.Is it correct?What to do next?Step by step if possible...

4. Aug 22, 2010

### OmCheeto

Those are close to the values I got: 16.265 ohms and 2.459 amps.

I would next find the voltage across the 11 ohm resistor.
From there you can determine the voltage drops across the 3 legs of your circuit, which will lead you immediately to I1.
And although they don't ask for it, you should then find the current through the 12 ohm resistor.
Knowing the currents through the 11, 12, & 13 ohm resistors will yield the current through the 14 ohm resistor. That will give you V3.

5. Aug 22, 2010

### city25

I don't think the equivalent resistance is 15.975 but 16.265

Sorry, I made a typing error.
You may first find "V3", by calculating equivalent resistance of the very right part.
then you may find V3 by the ratio of resistance

6. Aug 22, 2010

### kai92

Can you tell me what are the final answers?Pls include the steps/calculation to get the answers.

7. Aug 22, 2010

### Ouabache

Welcome kai92 to the PF forums!!
The people here are trying to help you. However you may want to review part 1 of https://www.physicsforums.com/showthread.php?t=94379" to appreciate what is expected of those requesting assistance.
You could start by telling us what you know about Kirchhoff's Laws applied to circuits.

Last edited by a moderator: Apr 25, 2017