Ohm's Law is a free Android-based application designed to assist electronics and electrical professionals and enthusiasts in calculating values for two unknowns given two known values. The app also features resistor calculators that determine bands given value or values given bands for three, four, or five-band resistors. Additionally, the app's preferences/lock functions allow values to either autorange to appropriate SI units or remain fixed.

The interface is clean, intuitive, and easy to navigate. It is also worth noting that the resistor calculator automatically determines whether the resistor has three, four, or five bands. However, users should be aware that the app has a "Rate" button that has caused some confusion among users who have commented on its placement. It is important to note that users are not required to rate the app before using it, nor are they even prompted to do so. Overall, Ohm's Law is a useful tool for anyone in the electronics and electrical field.

It is important to note that there is a paid app called "Electrist" that offers additional features, such as identifying EIA standard values and more calculations.