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1994-01-09
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Ohm's Law Calculator -- (c)1993,94 Alan P. Summerlin
User Manual
Rev. 1.00 12/16/93
Rev. 1.10 1/9/94
Disclaimer
----------
The author assumes no responsibility for damages, etc. related to the
use of this software (by registered or non-registered users). Every
effort has been made to make sure that the data provided by this
program is accurate. You are encouraged to check any data that does not
seem correct. If you encounter a 'bug' or problem, please let me know
by writing to me at the address below. Every effort will be made to
correct any problem found.
Shareware Notice
----------------
This product is released as shareware. You may evaluate it for up to 30
days. If at that time you have not registered, you must discontinue its
use! Registration fee is $15(US) for a single user license. Write to me
if you are interested in a multi-user or network license. To register,
send payment (check or money-order) to:
Alan P. Summerlin
P.O. Box 58252
Raleigh, N.C. 27658
Be sure to indicate that you are registering Ohm's Law Calculator. All
registered users will receive at least one free update when and if
available.
About Ohm's Law
---------------
This program should be useful to any electronics engineer, technician,
student, or hobbyist. It eliminates the need to memorize all the
possible formulas derived from the two basic formulas I=E/R and P=IxE.
There are 12 formulas that can be derived from these two. Here they
are:
╔══════╤═════╦═════╤═════╗
║ E²/R │ I²R ║ E/R │ W/E ║ Where :E is volts
╟──────┼─────╫─────┼─────╢ R is ohms
║ E I │ W ║ I │√W/R ║ I is amps
╠══════╪═════╬═════╪═════╣ W is watts
║ √WR │ E ║ R │ E/I ║
╟──────┼─────╫─────┼─────╢
║ W/I │ I R ║ W/I²│E²/W ║
╚══════╧═════╩═════╧═════╝
Now that you have OL.EXE it will no longer be necessary to keep
these at hand.
Requirements
------------
OL.EXE should run on any PC with any processor or video system. If you
are unable to run it, please let me know. Write to me at the above
address and describe you system.
The program also runs under MSW 3.1 as a DOS task.
The program requires at least 128K of RAM. A mouse is also required.
The program will abort if no mouse is found.
An EPSON compatible printer is required to get a hardcopy of your data.
Using OL.EXE
------------
I recommend installing the program onto your hard drive before running
it. See your DOS manual if you need help with this task.
To run the program, type OL <ENTER>. The program will load and you
should see the worksheet window. This window is where you will enter your
known variables into data fields. Enter a known variable in the presently
highlighted field. To switch between fields, use the cursor keys or click
on the desired field with the mouse.
Two known variables must be entered for the calculator to work properly.
If less that two or more than two are entered, a error message will be
displayed. The <BACKSPACE> key can be used to erase characters in the
data fields.
To the right of the data fields you will see a group of radio buttons
for each field. Use the buttons to select the unit of measure of each
data item. The mouse is required to manipulate the radio buttons. For
example, if the Resistance field contains 1.5 and the (∙)KΩ unit is
selected, the value is 1500Ω.
There are six buttons at the bottom of the worksheet. To select a
button, click on it with the mouse or press the highlighted key.
The 'Calculate' button or <C> is used to calculate the unknown
parameters. Again, you must provide two known variables. Once the
calculate button has been pressed, the result window pop up with the
results. Press the 'Ok' button or <ENTER> to exit this window. Press
the 'Print' button see the "Print Options" window. This window will
allow you to send your data to a printer (LPT1 only is supported).
There will be an error message generated if your printer is not
ready. The print window will allow you to enter a note for the
calculation. This note may be up to 49 characters in length. There are
four options to chose from. Click the 'Print' button or ALT-P to print
the note and data. Click the 'Line Feed' or ALT-L to send a line feed
to the printer. Click the 'Form Feed' or ALT-F to send a form feed to
the printer. Click the 'Quit' or ALT-Q to quit this part of the
program.
The 'cleAr' button or <A> will erase the data in the current data
field. This is more convenient that using <BACKSPACE> to rub out the
characters.
The 'Standards' button or <S> will pop up a window which displays all of
the 1% standard resistor values. Click on the 'Ok' button or press
<ENTER> to exit this window.
The 'Quit' button or <Q> will cause the program will terminate and return
to DOS.
The 'Info' button or <I> will display some basic information about the
program. Click on the 'Ok' button or press <ENTER> to exit this window.
The 'Help' button or <H> will display a basic help screen. Click on the
'Ok' button or press <ENTER> to exit this window.
Feedback
--------
Please feel free to contact me if you have suggestions for improving
the program, or features you would like to see added, write me at the
above address.