(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[PLAIN]http://img163.imageshack.us/img163/408/circuit2w.jpg [Broken]

We are asked to solve for I. I found I = -4 Amps.

I want to verify my answer using KVL in the bottom left mesh

2. Relevant equations

KVL

3. The attempt at a solution

I follow the convention: voltage drops are positive, which means that the first sign I hit is the sign of the voltage. Starting at the 8 ohm resistor:

- 8*(-4) + ( ????? ) - ( ?????) = 0

I am confused because we usually apply KVL using the voltage drops/rise between elements. For the current source and the 2 ohm resistor, I have the node voltages between these elements. Therefore, I don't know if the current source is + (v2 - v1) or - (v2 - v1). Same thing for the 2 ohm resistor, I hit the - sign first, but is it - (v2 -0) or - (0-v2) ????

I am a little bit confused.. thank you very much

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: KVL and node voltages

**Physics Forums | Science Articles, Homework Help, Discussion**