# A kirchoff's law question with multiple batteries

1. Apr 25, 2012

### Chester8990

1. The problem statement, all variables and given/known data
To find the voltage at the 5 ohms resistor.

2. Relevant equations
V=IR
Kirchoff's first and second law

3. The attempt at a solution
The attempt was simply too long
I ended up with a voltage of 6.5V on the 5 ohm resistor...
What I wasn't confident with was the three batteries too...
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Apr 25, 2012

### Staff: Mentor

Could I suggest that you do yourself a favour and resolve to never refer to a voltage "at" any element? By always referring to "a voltage across" an element, or to a "voltage between two points" you will be giving yourself a subtle reminder of how you must go about determining the parameter.

So, what approach will you use for determining the voltage across the resistor in question?

3. Apr 25, 2012

### Staff: Mentor

You'll have to show an attempt before we can know how to help. Them's the rules.

As a suggestion, write a KCL node equation for the node where all the resistors come together. Choose the bottom node as the ground reference.

4. Apr 26, 2012

### Chester8990

never mind guys i solved it, thank you