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

http://rgoth.com/q18.gif [Broken]

2. The attempt at a solution

I followed Kirchoff's Rules for part A of this question by outlining three formulas. Each starts at point A on the diagram

-(6)I1 + 18 - (6)I1 + 8 - (22)I3

I3 = [-26 +(12)I1]/-22 ******formula 1

-(6)I1 +18 -(6)I1 - (14)I2 = 0

I2 = [-30 + (12)I1]/-14 *****formula 2

I1 = I2 + I3 *******formula 13

By combining these three formulas I solved for I1 and used that to find I2 by using formula #2

My final answer is 0.96 amp

Because this is positive it means I chose the right direction for my current with my original formulas. Therefore the current is flowing counter clockwise in the circuit... Is that right?

does this look right. I have never done a question with three batteries of which one is facing the opposite way to the others...

for part b do I just add each emf to find the voltage across ab

ie

12V - 8V + 18v = 22V

I minus because it faces the opposite direction as the 12 V emf

I don't think this looks right at all but I am unsure where to go.

**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: Kirchhhoffs rule

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