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tmint
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Homework Statement
Here is the circuit: http://gyazo.com/1e11d9208da0aa29d10b72128844ad40
What is the Electric Potential at Point A?
Battery 1: 6.76 V
Battery 2: 11.8 V
Resistance 1: 100Ω
Resistance 2: 217Ω
Resistance 3: 312Ω
Homework Equations
Kirchhoff's Rules
V=IR
The Attempt at a Solution
I first set up my Currents so that Current 1(left)+ Current 2(down middle)= Current 3(right)
Let c be left of point a, b the point bottom of point a, d left of b, e right of point a and f right of b.
cabdc: -217(Current 1)+100(Current 2)=-6.76
=-217(Current 1)+100(Current 2)
aefba: -312(Current 3)-11.8-100(Current 2)=0
=-312(Current 3)-100(Current 2)=11.8
Let Current 2= Current 3-1
So..
-217(Current 1)+100(Current 3-1)=-6.76
-312(Current 3)-100(Current 3-1)=11.8
And I get
312(Current 3)-217(Current 1)+200(Current 3-Current 1)=-18.56
I'm stuck at this step, could use some help.
Thanks.