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

Two batteries and three resistors are connected as shown in the figure .

http://session.masteringphysics.com/problemAsset/1122583/1/Walker.21.52.jpg

A) How much current flows through 6.0 V battery when the switch is closed?

B) How much current flows through 9.0 V battery when the switch is closed?

C) How much current flows through 6.0 V battery when the switch is open?

D) How much current flows through 9.0 V battery when the switch is open?

2. Relevant equations

Kirchoff's Rule

3. The attempt at a solution

I broke it down into two different loops, the one on the left and the one on the right. I labeled the 6V battery as E1 and the 9V one as E2. I called the current flowing upward from 6V I1 and the current flowing upward from 9V I2. I labeled the resistor under the 6V battery R1 and the resistor under the 9V battery R2.

From this, here are my equations:

For Loop 1:

E1-E2-I1R1+I2R2=0

For Loop 2:

E2-I3R3-I2R2=0

Both of these due to Loop Rule.

I'm not sure where to go from here, or even if these are totally correct.

Help would be great :)

**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: Loop Rule - Batteries and Resistors

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