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
All original content copyright, © 2011-2026. Edward Shore. Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited. This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.
