HP HP-32S - Page 184

First write the equations for the voltage drops around each loop.
For loop 1: 4X - 4Y + 15X - 15Z - 40 = 0
For loop 2: 4Y - 4X + 8Y + 10Y - 10Z = 0
For loop 3: 10Z - 10Y + Z + 15Z - 15X = 0
Combining like terms within each equation produces
19X - 4Y - 15Z = 40
-4X + 22Y - 10Z = 0
-15X - 10Y + 26Z = 0
Keys:
Display:
Description:
|XEQ|A
Revalue
Starts input routine.
19 | R/S|
B?value
Sets first coefficient, A,
equal to 19.
4 L!>y | R/S |
C?value
Sets B equal to —4.
i5by|R/s|
D?value
Sets C equal to -15.
•
Continues entry for D
through L.
0|R/S|
fi? 19.8898
Enters L and returns to
first coefficient
entered.
|XEQ|S
X=7.8601
Solves system of equa
tions and displays X.
| R/S |
Y=4.2298
Displays Y.
IR/SI
Z=6.1615
Displays Z.
182 12: Mathematics Programs