Ohm's Law

Red Binary

About this app

Two common calculators for electronics/electrical use:

Ohm's law calculator/Watt's Law calculator: figures any 2 unknown values given 2 known values

Resistor calculators: figures bands given value or value given bands. For 3, 4, & 5 band resistors

* Preferences/lock functions allow values to either autorange to appropriate SI units or remain fixed

* Resistor calculator automatically determines 3, 4, or 5 band

* Clean, intuitive interface

*** To the few who have commented that it's "stupid" to have the "Rate" button where it is, please stop && think. You don't HAVE to rate it before using it, nor are you even being asked to. You will notice that there are 2 buttons. This is the "About" dialog that is shown the first time you run any new version or tap the "About" menu item. Please think before you speak. Thank you. ***

Paid app "Electrist" identifies EIA standard values, as well as adds many more calculations. See for yourself:
https://market.android.com/details?id=com.redbinary.electrist

Ratings and reviews

The application works & is accurate. But the Guide is why I got it. I always forget the formulae, in spite of 40+ years' experience. (Age, i guess) --------------- It is big print, so even I can read the screen. One addition that would be appreciated is, when calculating power, if the option to calculate 3 phase watts when voltage and amperage are entered. (And visa-versa. Insert power and voltage to get 3 phase watts.) And, if I may be greedy, install a power factor calculation. Oh Wait- My phone has a calculator...

Excellent! It just makes it easy. I have this stuff memorized, but sometimes it's just easier to plug in numbers and GO!

Very simple to use and quicker than my calculator. Adding recommended cable size to the standard Ohm's pyramid would make it perfect.

What's new

1.71 [Mar 3, 2012]
+ added some exception handling and better handling of parsing numbers from input strings