I'm going to try to add this to wikipedia soon under "ohm's law"

A useful way to calculate how many appliances that you can plug into the wall socket is to know how to use ohm's law. It can be read as (I=V/R) or (V=IxR) or (R=V/I). And if you know 2 of the input values for the equation, you can then determine the value of the missing value. And if you were to determine the
an easy way to remember the 3 equations is the pie chart
LATER ADDED: I decided not to because it wasn't totally accurate for the subject and I couldn't find the accurate picture online and would have to make it myself and it may not have been accepted anyway.