Ohms Law Calculations
This program takes the basic Ohm's Law expressions and
allows you to calculate Watts, Ohms, Volts, and Amperes with
any 2 known values.
You may enter a number of up to 6 digits. The output will be
calculated to the nearest 1/100TH.
The expressions used to calculate are as follows:
TO OBTAIN WATTS:
1. (E SQUARED), DIVIDED BY R;
2. (I SQUARED), MULTIPLIED BY R;
3. E MULTIPLIED BY I [Single Phase];
4. (E MULT BY I), MULTIPLIED BY 1.732 [3 Phase];
TO OBTAIN OHMS:
5. (E SQUARED), DIVIDED BY W;
6. W, DIVIDED BY (I SQUARED);
7. E, DIVIDED BY I;
TO OBTAIN VOLTS:
8. I MULTIPLIED BY R;
9. W DIVIDED BY I;
10. SQUARE ROOT OF (W, MULTIPLIED BY R);
TO OBTAIN AMPS:
11. E, DIVIDED BY R;
12. SQUARE ROOT OF (W, DIVIDED BY R);
13. W, DIVIDED BY E [Single Phase];
14. (W, DIVIDED BY E), DIVIDED BY 1.732 [3 Phase];
WHERE E = VOLTS; I = AMPS; R = OHMS; W = WATTS.
1.732 represents the square root of 3, used in calculating
3 phase circuits.
The Program is completley menu driven, additional documentation
should not be necessary.
To give you a example, start the program at the DOS prompt by
typing "Ohms" and press the Enter key. A brief sign-on screen
will appear, as well as the version number.
Let's say you want to know how many Amps an electric heater
draws. You know how many Watts it consumes, as well as the
operating voltage. You are calculating for Single Phase.
At the MAIN MENU, press "4", and at the SUB-MENU press "3",
to calculate Amps when the Watts and Volts are known.
Enter the value for Watts. For our example, lets say 1200
Watts. Next enter the value for Volts. Let us assume 120
The program will take the correct expression and calculate
the Amps. For this example, the expression = W, Div by E.
1200 Watts, Divided by 120 Volts = 10.00 Amps.
You may calculate another similar value, return to the sub-
menu, or return to the main menu to calculate a different
value, or quit the program.
Please notice the result is for DC or AC resistive circuits.
Also for AC circuits, the results may be for single or 3 phase
circuits in the "Watts" and "Amps" SUB-MENUS.
You are free to copy and distribute the program as long as
you do so by copying the program and documentation together
without alteration, and without charge. If you find the
program useful, a contribution would be appreciated.
The author assumes no responsibility for inaccuracies
obtained from using the for-mentioned program.
Please report any problems to the author.
2829 N. Russet St.
Portland, OR. 97217-6247 88-03-15