Here is a handy Electrical Formula Wheel I found recently on the Web.
These are the basic electrical/electronic formulas I use on a fairly regular basis when doing electrical automation designs.
These formulas are all derived from 2 simple formulas and these are:
V = I x R
P = V x I
- V = Voltage (in Volts)
- I = Current (in Amps)
- R = Resistance (in Ohms)
- P = Power (In Watts)
All of the formulas in the Formula wheel can be derived from the above 2 basic formulas using a little algebra. In fact this is what I typically do. I derive whatever formula I need starting with the 2 basic formulas and derive the needed formula. Probably most electrical engineers do this as well I would dare say. Still it is nice to see these formulas layed out in this wheel format. It shows the power of learning just 2 simple formulas.
For those new to the basic calculations used in electrical design or those that want a quick reference they can use throughout their careers I recommend “Ugly’s Electrical References“. In addition to providing these simple formulas it also is a great reference for doing 3 phase power calculations and converted between single phase and 3 phase power equivalents. I find myself turning to this reference over and over. For example, It seems I regularly turn to this reference when doing power calculations since as a controls engineer I need to refresh myself when doing 3 phase power calculations. Ugly’s also contains motor and conduit sizing tables from the NEC (National Electric Code) book as well as other valuable information, all in a back pocket-sized reference.
Updated: March 5, 2011 | Created: Feb 14, 2011