This is my paperwork. It's what I write down the second the clock starts, before I touch a single question — the two wheels and the formulas. Make your worksheet look just like this every time you study and do math, and on test day it just falls out of your hand. You're not remembering formulas under stress; you're already set up, just working the problem.
Free Test-Day Worksheet — Ohm's Law & Power Wheels
Ohm's Law & Power wheels · voltage-drop formulas · NEC 2023
How to use the wheel: cover the value you want. Ohm's Law — cover E and you see I×R (multiply); cover I and you see E over R (divide); cover R and you see E over I. The Power wheel works the same way with P, I, and E.
This free test-day worksheet is the paperwork I set up the moment the exam clock starts, before I look at a single
question. Two wheels and a short list of formulas. It takes about ninety seconds to write out,
and from then on I am not trying to remember anything under pressure — I am just working
the problem in front of me.
What is on it
The Ohm's law wheel — E, I and R. Cover the one you want and the other two show
you whether to multiply or divide.
The power wheel — P, E, I and R, for the questions that give you watts and want
amps, or amps and want watts.
Voltage-drop formulas, single-phase and three-phase, with the 2 and the 1.732 where
they belong.
The conversions that come up constantly — percent to decimal, kW to watts,
horsepower to amps, kVA to VA.
How to actually use it
Do not save it for test day. Write it out every single time you sit down to practise, on
a blank sheet, from memory. Do that for a couple of weeks and on the real day it falls out of your
hand without you thinking about it. Practising the setup is the point — not the sheet
itself.
You do not bring this into the exam. You write it out on the scratch paper they give you
once the clock has started. What that scratch paper looks like varies — some testing centres
hand you a laminated board and a marker, some give you paper — so ask your testing company
what they provide when you book, and practise on the same thing.
Why it works
Nearly every calculation question on a journeyman or master exam is one of a small number of
shapes. The trouble is almost never the arithmetic — it is deciding whether to multiply or
divide while the clock runs and you are second-guessing yourself. The wheels take that decision
away. You cover the value you want and the picture tells you.