I have constants V1, V2 and R1, R2, R3, R4, R5. these are randomly generated

i have equations, V1 = i1*R1+(i1-i2)*R4

0 = i2*R2+(i2-i3)*R5+(i2-i1)*R4

-V2 = i3*R3+(i3-i2)*R5

i need to know what i1 is equal to when only given the constants

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- Oct 17th 2012, 12:41 AMJayTahmer3 Equations 3 unknowns need help solving
I have constants V1, V2 and R1, R2, R3, R4, R5. these are randomly generated

i have equations, V1 = i1*R1+(i1-i2)*R4

0 = i2*R2+(i2-i3)*R5+(i2-i1)*R4

-V2 = i3*R3+(i3-i2)*R5

i need to know what i1 is equal to when only given the constants - Oct 17th 2012, 01:36 AMchiroRe: 3 Equations 3 unknowns need help solving
Hey JayTahmer.

Can you find a matrix for this system where Ax = b where x is the vector of i's, b is the right hand side (constants) and A is the system of equations? How much matrix stuff and linear algebra do you know? - Oct 17th 2012, 02:13 AMJayTahmerRe: 3 Equations 3 unknowns need help solving
would the matrix be like this

Attachment 25260

Attachment 25261

Attachment 25262 - Oct 17th 2012, 07:01 AMJayTahmerRe: 3 Equations 3 unknowns need help solving
solved.

- Oct 17th 2012, 01:02 PMWilmerRe: 3 Equations 3 unknowns need help solving
Well, in case helpful, your 3 equations reduce to:

R2 * I2 + R3 * I3 - V1 + V2 = 0