Impedance

The general notion of the ratio of a sinusoidal voltage to a sinusoidal current is called "impedance". We derive the impedance of a resistor, inductor, and capacitor. The impedance of the inductor and capacitor has a term for frequency, so the impedance of these components depends on frequency.

[maxbingen]

for those when it didn't click (which it didn't for me at first),
the reason why I = C dV/dt is because I = dq/dt and Q = CV, combining those two, dQ/dt = C dV/dt = I

[afr]

Actual explanation of what impedence is comes at 9:20

[elsf]

That really explained impedance better than any way it's been taught to me 😄

[jonmckay]

I like the explication of impedance as both mathematically and graphically! Great job!

[johncgibson]

1:43, text books usually uses a expression function called "The real part of", and the text books don't need to throw away the negative part for some mysterious preference.

[MiCreationOfficial]

Simple concept of impedance: Imagine you're playing with water flowing through a bunch of pipes. Now, think of impedance like the pipes being twisty, narrow, or bumpy. These things make it harder for the water to flow smoothly. In a circuit, impedance is like those twists and bumps but for electricity instead of water. It's what makes it a bit tricky for electricity to move around smoothly in the wires. So, just like you'd feel resistance when pushing water through a twisty pipe, electricity feels impedance when flowing through a circuit.

[ntwanakasi]

i have been struggling for so long with this impedance topic. thank you sir

[sjjvddyumiherhv]

thank for explaining a whole semester in one video

[wkw]

My final is tomorrow and I need more videos 😭

[prasantikumarshee]

3:41, really how can you do this with us .😂😂

[tnekkc]

This reminds me of EE in the 1970s at university... not much like designing power supplies in the 80s and 90s.

[AppleUploader]

No matter how hard I try I will seriously never understand physics. It's black magic

[andjelkastokic]

Really great explanation!!
My question is, are you going to make a video about complex AC circuits ? @khanacademy

[J_H_Rahbek]

good video on this, would love some examples with vectors in the complex plain to illustrate whats happening, as well ad the impedance for RL, RC and RLC but great video dude! Love the color coding haha

[SeanMcDonnell]

kind of wish this started with an explanation of what impedance actually is maybe with a water metaphor or something

[foerfoer]

If you start assuming that v=iR, it is normal that in 3:55 you obtain again v=iR, I can't see why you say you proved v=iR if it was the starting point.

[curtpiazza]

Cool stuff! Thanx for showing the derivations! 🎉

[ConorFenlon]

Your speech pitch range and pattern characteristic is very close to Bill Murray.

[louco]

Thank you for the video, this is beautiful math!

[Freakybananayo]

This jumps straight in without explaining much