I come from a physics background and mostly just lurk this sub, but anyway the whole i-vs-j feud would have been solved a while ago if everyone just agreed to use j for current rather than i. Then i would be the obvious choice for √(–1)
Edit: messed it up the first time. J for current, i for imaginary unit
The Imaginary Moot!!!!
to play devils advocate
we use j for current density
However because of the skin effect and transfer of energy through the electromagnetic field we need not consider current density in complex circuits
however, i work in fuel cell industry so current density is quite important. The Maximum amount of current generated by a Fuel Cell (at Open Circuit Voltage) is proportional to the area of the stack plates.
edit-
current density can be of concern in AC circuits however anywhere you are using complex numbers net power is 0. The distance between parallel circuits is far more important to consider in say transmission lines.
In my experience, high power DC is where current density needs to be considered far more frequently.
Yeah you might be mixing it up. Dimensions on volume density are charge per unit volume (C / m^3) which is generally rho. current density refers to current per unit cross sectional area (C / s*m^2) or (A / m^2) which is generally J.
Lol “this problem would be solved if an entire academic discipline and profession changed how they do things, to do it our way which is right through no objective standard only arbitrary preference”
Also J is already used
…you don’t think that’s true? Try grad semiconductors. I and J and current and current density J = I/A. Small signal convention is current or current density is the sum of the DC current (capital letter) and AC signal (lower case). So you could have
J = J_DC + j(t)
I have a PhD in EE specialized in semiconductors man.
Mathematics point of view i is absolutely correct but when talking about electrical engineering numerical we mostly use j to remove confusion between current (i) and iota (i)
I'm finishing up my EE degree and we use j when doing node voltage equations, but I always used i in my math courses now that I reflect on it...but even in EE classes we sometimes used i when evaluating the length & angle version of a complex number. It would be nice to have a universal standard tbh, but maybe there's a reason I'm unaware of that would make this impossible?
As long as we're wishing for i's or j's (whatever your preference), I'll throw a hat in the ring: let's all go back to calling *voltage* its original name: *electromotor force*. Cuz that's what it actually does. It's the potential delta that behaves like a *force* that makes electrons move around. Far more descriptive.
Plus, we could continue to use *v* for it in our equations and confuse the hell out of everyone! Especially undergrads!
I learned with very little help so basically all of my loops looked like this:
uint8_t count5 = 0;
while(count<148)
{
count++;
//Code here//
}
And yes, I used separate count variables for every loop.
What a complex joke. I imagine only a few will get it.
> I imagine only a few will get it You mean: j jmanjine only a few wjll get jt
What a complex ioke
I love you
Real
Are the people who say *jmaginary* unit the people who also say *jiff* instead of gif?
[удалено]
Big brain move: Use c for current.
s for the speed of light?
L=jw for frequency response?
w or …. ω
Definitely w.
That's ridiculous. It's obviously gjf
Ugh! It’s GIF! Not GIF!
I thought it was a GIF
Naw, it’s a GIF
**jmagjnary unjt
Huh that's a weird coincidence.
‘|value| ∠ phase’ is the way
Gigachad Phasor Form Enjoyers
Ah hell nah
Gotta use both forms anyway for the math
just like your Nintendo simp sauce your not funny
no one will forgive you for the nintendo simp thing fuck you
I come from a physics background and mostly just lurk this sub, but anyway the whole i-vs-j feud would have been solved a while ago if everyone just agreed to use j for current rather than i. Then i would be the obvious choice for √(–1) Edit: messed it up the first time. J for current, i for imaginary unit
The problem with that is J is used for current density.
Which is used 100x less frequently
Not in my part of town (motors). But then we got the other fucked up bit that J is also moment of inertia.
The Imaginary Moot!!!! to play devils advocate we use j for current density However because of the skin effect and transfer of energy through the electromagnetic field we need not consider current density in complex circuits however, i work in fuel cell industry so current density is quite important. The Maximum amount of current generated by a Fuel Cell (at Open Circuit Voltage) is proportional to the area of the stack plates. edit- current density can be of concern in AC circuits however anywhere you are using complex numbers net power is 0. The distance between parallel circuits is far more important to consider in say transmission lines. In my experience, high power DC is where current density needs to be considered far more frequently.
True, I’d forgotten that. σ for surface density, λ for linear density, j for volume density? Or am I thinking of charge rather than current?
Yeah you might be mixing it up. Dimensions on volume density are charge per unit volume (C / m^3) which is generally rho. current density refers to current per unit cross sectional area (C / s*m^2) or (A / m^2) which is generally J.
J the current density vector, A/m2
Lol “this problem would be solved if an entire academic discipline and profession changed how they do things, to do it our way which is right through no objective standard only arbitrary preference” Also J is already used
Yes 😎
Boo this man!
We use j because we can't be bothered to tell i from I. Idk if we're the chad's here.
Both I and i are used for current (i being “instantaneous current”)
I = DC i = AC
Ahh my issue is I tend to stick to the straight lectricity not the wobbly kind.
at end of the day it doesnt really matter … i usually use x for any unknown im trying to calculate for
\_\_\_\_ ∠θ gang
How do you write jX=jωL ?
X∠90 = ωL∠90
I use i for everything, including functions and variables. Just use different fonts. Thank god for LaTeX.
int lIllI lIllI=lIllI|!lIllI;
Reeeee
Soyboy: 1+8i, Chad: 3+ j3
That is the one thing that drives non-EEs up the wall
As someone who has been studying both physics and electrical engineering, I hate a mfer who uses i, j, and k as unit vectors.
I hate this "(-1)^(1/2)"
Oh yeah jmaginary
lol we just studied about it this week , I dont get the point behind changing the notation
Because i is current and j is used in place of i for the imaginary number.
oh this makes sense
What about \iota?
If you’re really an expert j(t) or j(w) are AC current densities.
No.
…you don’t think that’s true? Try grad semiconductors. I and J and current and current density J = I/A. Small signal convention is current or current density is the sum of the DC current (capital letter) and AC signal (lower case). So you could have J = J_DC + j(t) I have a PhD in EE specialized in semiconductors man.
...I thought most people used "i"? But then I've already accepted I'll never be a giga chad so, "i" it is!
Mathematics point of view i is absolutely correct but when talking about electrical engineering numerical we mostly use j to remove confusion between current (i) and iota (i)
I'm finishing up my EE degree and we use j when doing node voltage equations, but I always used i in my math courses now that I reflect on it...but even in EE classes we sometimes used i when evaluating the length & angle version of a complex number. It would be nice to have a universal standard tbh, but maybe there's a reason I'm unaware of that would make this impossible?
It won’t happen, we still show electrical flow from the positive terminal. We’re a stubborn bunch.
The last time I saw a complex number was university, these days people are impressed if I can add numbers together in my head.
In one class we had that i = -j
I have no idea what this means so to me it is literally just about the letters themselves, and I totally get it.
Nah mate im a LYIF enjoyer
MatLAB lads be like...
1i enjoyer
Why do i get this… what choices have lead me here?
As long as we're wishing for i's or j's (whatever your preference), I'll throw a hat in the ring: let's all go back to calling *voltage* its original name: *electromotor force*. Cuz that's what it actually does. It's the potential delta that behaves like a *force* that makes electrons move around. Far more descriptive. Plus, we could continue to use *v* for it in our equations and confuse the hell out of everyone! Especially undergrads!
I learned with very little help so basically all of my loops looked like this: uint8_t count5 = 0; while(count<148) { count++; //Code here// } And yes, I used separate count variables for every loop.