
Principles of Analog Electronics
158
It is useful to solve the matrix system with a MATLAB
®
routine:
% MATLAB routine
M = [60 −10 0; −50 20 50;80 40 −30];
V = [15
15
0];
I = linsolve(M,V);)
From this, it is possible to identify all the current values:
R
0.29
112
R
0.27
212
R
0.32
31
R
0.06
42
(the latter value is not zero, so the example is for an unbalanced bridge)
R
0.56
51
The meaning of the negative value of
4
R
is that the current ows in the
opposite direction with respect to that of the gure. Applying Ohm’s law to
each resistance, we determine all the voltage values too:
RR
2.9
111
RR
5.3
222
RR
9.7
333