I’m not saying that most people aren’t formula pluggers (and that’s a big problem) but, my first impression of that kind of card would be that’s it’s meant to be branding, not a tool. Someone is carrying around a piece of what they love.
Just out of curiosity (I don’t mean this to be a dig and don’t carry either cards), why are Maxwell’s Equations good but Ohm’s Law is an instant no-hire? How I remember the story is that, when Ohm published his equation, it came as a huge shock because no one was expecting it to be so simple. There’s a lot of beauty in that simplicity. Maxwell’s equations aren’t that complex but they aren’t exactly _linear_. Valuing complexity is an interesting hiring tactic but would probably be a great filter on younger engineers?
1. Ohm's Law is taught the first day of 4 years of an EE degree. Ohm's Law should be part of your soul, not something a cheat sheet is needed for.
2. The 3 versions of the formula are obvious to anyone who remembers high school freshman math. It's barely even algebra.
Carrying that cheat sheet signals you know neither electronics nor the most basic algebra.
Maxwell's Equations, however, get introduced in 2nd or 3rd year in college. You'll need a year (probably two) of calculus to even understand the notation. The equations unify the theories of electric fields and magnetic fields.
Only people who have studied Maxwell's Equations will even recognize them, so by putting them on a t-shirt you're signalling that you are an educated EE to other educated EEs. Other people won't even know what they are.
Then a smug physicist will walk by with either the the equations of quantum electrodynamics or Maxwell's equations in terms of differential forms on their t-shirt
Besides, EEs usually cheat by assuming a sinusoidal solution anyway.
