Ohm's Law Calculator & Guide

This is an Ohm's Law Calculator with a built-in mini-guide to refer to if required. The calculator is very easy to use, enter two known values, select the units, press 'Calculate' and the other two values will be displayed instantly! The guide contains 7 parts: Ohm's law. Watt's law. Adding resistances. Voltage formulae. Current formulae. Resistance formulae. Power formulae.