HP 12C Platinum: RC Series Circuit Analysis
The program was originally posted on the Museum of HP Calculators website (https://www.hpmuseum.org/forum/thread-24591-post-215436.html#pid215436).
A difference between the HP 12C Platinum and the HP 12C Classic is that the Platinum has a square function (x²). The square function is the g-shifted (blue) of the multiplication key.
Introduction and Program Code
Given the following of a RC series circuit:
Stack Z: E: voltage of the RC circuit
Stack Y: R: resistance of the resistor (R) in ohms (Ω)
Stack X: Xc: equivalent resistance of capacitor (Xc) in ohms (Ω)
What is calculated:
Stack Z: equivalent impedance of the RC series circuit in ohms (Ω), Z = √(R^2 + Xc^2)
Stack Y: current in amps (A), I = E ÷ Z
Stack X: true power in watts (W), P = I^2 * R
Program Code:
x^2 |
001 |
43, 20 |
beginning of the program |
x<>y |
002 |
34 |
|
STO 0 |
003 |
44, 0 |
store resistor |
x^2 |
004 |
43, 20 |
|
+ |
005 |
40 |
|
√x |
006 |
43, 21 |
|
PSE |
007 |
43, 31 |
show impedance |
ENTER |
008 |
36 |
|
R↓ |
009 |
33 |
|
÷ |
010 |
10 |
|
PSE |
011 |
43, 31 |
show current |
ENTER |
012 |
36 |
|
x^2 |
013 |
43, 20 |
|
R↓ |
014 |
33 |
stack manipulation (014 – 018) |
R↓ |
015 |
33 |
|
x<>y |
016 |
34 |
|
R↓ |
017 |
33 |
|
R↓ |
018 |
33 |
|
RCL 0 |
019 |
45, 0 |
|
× |
020 |
20 |
|
GTO 000 |
021 |
43, 33, 000 |
finish program, show power |
Example
E = 150 V
R = 19 Ω
Xc = 10 Ω
Results (to four decimal places):
Z ≈ 21.4709 Ω
I ≈ 6.9862 A
P ≈ 927.3319 W
Source
Noll, Edward M. Basic Electronics Math With a Scientific Calculator Howard W. Sams & Co, Inc. Indianapolis, IN. 1977. 0-672-21425-3 pp. 81-98
Eddie
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