- #1
Xmo91
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Homework Statement
Where XX is 60V
I'm trying to find the node voltages at point A and B, however each time I've tried this and then checked using circuit wizard it has come up incorrect. Yes my circuit in circuit wizards is correct.
Homework Equations
The Attempt at a Solution
V1: I1=I2+I3+Iground
60-V1/25 = V1-V2/40 + V1-40/30 + V1-0/10
then i multiplied by 600 to remove the denominators
1440-24V1=60V1 +15V1-15V2+2-V1-800
2240=119V1-15V2 (Eqn 1)
V2: I2+I3=2.5+Iground2
V1-V2/40 +V1-40/30=2.5 + V2-0/20
then i multiplied by 120 to remove the denominators
3V1 - 3V2 + 4V1 - 160 = 300 + 6V2
7V1-9V2=460
I then put them into a matrix and tried using cramers rule to solve for v1 and v2
119 -15 l V1 l l 2240 l
7 -9 l V2 l l 460 l
119x-9 - -15 x 7
Doriginal= -966
2240 -15
460 -9
2240 x -9 - -15 x 460
D1= -13260
119 2240
7 460
119 x 460 - 2240 x 7
=39060
V1= -13260/-966 = 13.7V (Circuit wizard shows it as being 2.37V)
V2= 39060/-966 = -40.43V (Circuit wizard shows it as being -9.71V)
please help!