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Topic: equations (Read 878 times) previous topic - next topic

tinman13kup

Just looking to see if anyone has a big cheatsheet of electronic equations they are willing to share.
Sure, ohm's law is easy enough, but there are so many more equations out there, and I can only remember so many of them.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

CrossRoads

V=IR
V/R = I
V/I = R
P = IV
P = I^2*R
P=V^2/R
PV=nRT
Period = 1/Frequency

What else do you need?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Southpark

ic approx equal to ie for bipolar junction transistor (under usual operating conditions).
ic approx equal to beta*ib for bipolar junction transistor.

ic is collector current, ib is base current, ie is emitter current

tinman13kup

I see you use "V", where I learned "E" for voltage.

As for what else I need..... I was looking for a whole laundry list beyond ohms law.  


transistors, mosfets, capacitors, inductors.....


Just a cheatsheet with the various equations. I've stumbled upon a few that were well laid out and easy to find what you were looking for, some just covering ohms law. I find it somewhat handy when I'm tired from dealing with the crisis of the day and just need to double check myself.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

Welcome tinman13kup.

Quote
I learned "E" for voltage
Electromotive Force?

Did you Google:
electronic formulas cheat sheet

Click Here




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MarkT

ideal capacitor:  C dV = I dt
ideal inductor:   L dI = V dt
resonant LC circuit:  f = 1/(2 pi) sqrt (1 / LC)
conductor in a magnetic field: F = B l I, V = B l v
RC time constant  tc = RC
RL time constant  tc = L/R
resistance of wire  R = rho l / A, rho = bulk resistivity, l = length, A = cross section area
ideal diode:   I  proportional to   e^(qV/kT), q = charge on electron, k = Boltzman's constant, T in kelvin,
or at room temp:  I roughly proportional to e^(39 V), doubles every 18mV or so, x10 every 59mV
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MarkT

You can derive:

energy in capacitor:   E = 0.5 C V^2
energy in inductor:    E = 0.5 L I^2
characteristic impedance of transmission line = sqrt (L/C)  - where L and C are inductance and capacitance
per unit length.
[ I DO NOT respond to personal messages, I WILL delete them unread, use the forum please ]

TomGeorge

Twinkle Twinkle Little Star Power Equals I square R.

Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

MarkT

PV=nRT
You sneaked in the ideal gas law!  Don't think I've needed that for electronics yet :)
[ I DO NOT respond to personal messages, I WILL delete them unread, use the forum please ]

jackrae

You sneaked in the ideal gas law!  Don't think I've needed that for electronics yet :)
Might be useful for calculation of how much magic smoke was released

tinman13kup

Twinkle Twinkle Little Star Power Equals I square R.

Tom... :)
NOOOOO!!! Make it stop!!! The voices in my head!!


Tom too
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

terryking228

And JUST when I thought this was getting really boring, I found the holiday shopping solution for two of my Grandchildren: HERE

Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

larryd

#12
Dec 14, 2016, 03:11 am Last Edit: Dec 14, 2016, 03:11 am by LarryD
That really looks like someone from way back:

No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

tinman13kup

That really looks like someone from way back:


Wonder how long it would take people to notice that??

Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

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