Online calculators

[Doug Coulter]

I keep running in to the ones hosted here when searching (eg too lazy to pick up the slide rule and do unit conversions and algebraic re-arrangement).
http://www.daycounter.com/Calculators/

Covers a whole bunch of what an EE does when estimating this and that.

[Doug Coulter]

Another one for the ft type ferrites: http://toroids.info/FT50-43.php

[Doug Coulter]

https://www.translatorscafe.com/unit-co ... lt-kelvin/

What a laugh, and one reason I don't pay much attention to silly claims of fusion temperatures in tokomaks. Nice big sounding numbers they report, but work it back to eV and...funny stuff. We're at what, 580e-6 K? All their math when attempted to apply to this is like talking about how viscous a snail trail is and comparing it to jet airplane envelope. We're just not on the same scales, different effects apply at this point.

Actually, if we get real coherent beams going, we're some multiple better than that - they are basing their calculations on spreading the eV energy into all degrees of freedom on top. If we get our approach right, we'll be using just one of those.

[Doug Coulter]

Give any two, calculate the 3rd. Handy. Tested here, reasonably accurate.

https://www.dextermag.com/al-inductance-calculator/