Ohm's Law Wheel

This website provides a variety of quick-reference resources pertaining to Ohm's/Watts law, wire gauge sizes, resistor color code, and calculators that automatically provide answers when numerical values are entered.

As it is explained on the site, "Ohm's law (named after the German physicist Georg Ohm) defines the relationship between Voltage, Current, and Resistance. The combination of Ohm's law and Joule's law gives twelve formulas where two of the four variables are known. The wheel is a handy tool and memory jogger. To use it, simply choose the quadrant corresponding to the variable you want to calculate, then select the segment corresponding to the variables that you know the values of."