Intro to Frequency-Dependent Impedance | Capacitors in Alternating Currents | Doc Physics

[@AirSheridan]

You're a hero man! Usually hate anything to do with circuits buy you're making it so much easier to get! Thanks again!

[@sherifhesham9151]

it is kinda hard here in Egypt to find a good high school teacher, all just make you memorize w/o actually EXPLAINING anything, and here you come to the rescue! thanks!

[@deepeshk1915]

sherif hesham the same case everywhere

[@alexandraow3604]

AGREEEEEEEEEE even thought I live in Cairo lol

[@Masspropagation]

I'm aware that this video is 5 years old now, but I'm going to have to steal this vocab to impress my nerd friends. These are just too great. I almost chocked on my food (he told us we should get lunch in that last video, I couldn't just ignore that) when he said "Doing so P-Thag". Why did I not know these videos existed until now?

[@lukejoseph8603]

Definitely says 'diarrhoea' at 2.01

[@AdityaCasio]

Lmao

[@elmakednos]

I am from Greece (Hellas).This diarrhoea you say is the Hellenic word "διαρέει".Also impedance is the Greek (HELLENIC) word "εμπέδηση".So bless Greeks that gave people of the whole world the knowledge because all west languages have decade of thousands of Greek words.

[@凌彬翔]

@@elmakednos what?

[@elmakednos]

Wonderfull explanation. It just remind me my school years. I can say that you explain things better than my original Greek (Hellenic) language.That means that your students are very lucky to have you.Also I can't understand why the number of likes in your video are low.I think people care for other loosers videos.This is no hopefull.

[@mehrpouyamovahadi1542]

2:00 what did I just hear? lol would you clarify please?

[@km-sc4kz]

These are some of the best videos i've seen on electronics, thanks so much!

[@kabandajamir9844]

The world's best teacher thanks

[@biffdiff6725]

"We need to have the scroot right here doing some pfauggggg" lmfao love your vids man 7:54

[@tobes9074]

'doin some Pthag' you sir are hilarious!

[@DocSchuster]

I believe that notation indicates that the capacitor and inductor do not dissipate power over a full cycle. You will find real resistance for resistors, 'cuz they heat up.

[@JBW19951]

For a capacitance equal 0 the impedance is infinite. This makes sense since it means your circuit is open. If you replace the capacitor with a piece of wire you'll get an infinite capacitance since the wire acts like a capacitor that takes an infinite time to charge.

[@stephonb12]

This is a great explanation, I was also highly amused by your pronunciation of square and square root. Keep it up!

[@srijitsen7986]

An amazing video indeed. Just had a small doubt. At 7:15 you said that when there is no capacitor in the circuit the impedance just equals the resistance. Is this because when you replace a capacitor with a conducting wire, the capacitance actually becomes infinite and thus the term containing 1/wc disappears?

[@PWLotus]

1/(w*c)^2, assuming c is zero, would be 1/(w*0)^2. w*0 = 0, so then we get 1/0^2. 0 times its self is just 0, so then we have 1/0. Anything divided by 0 is just 0, so then that final piece is just 0. Plugging that into the equation, we would be taking the square root of R^2 + 0, which would just give us the square root of R^2, which would give us R. I sure hope this year late answer helps someone.

[@sarthak9609]

Nymphaea Caerulea 2 years lol

[@blahblahblah747]

Can someone explain why vector addition works in this case? Like why is V total of the circuit equal to the vector addition of the 90 degree out of phase vectors?

[@AmrYouSSeFMuStaFa]

Amazing explanation ! ,, keep it up (Y) I have a question, please ! what does it mean for the impedance of capacitor and inductor to be an imaginary number (Xc= 1/jwc ,, Xl = jwL ) ?

[@ismaileyaqub6335]

doc, you said you were using Vmax and Imax - but can you also use the Rms values with phasors?

[@astorina]

hello , first THX !! you video are very interesting A simple question : why , at microscopic level, Z is proportional to the inverse of w ? Some clue apart the math explanations ? Is it related to dielectric relaxation time ? Brgds Antonio

[@MatheusSilva-dragon]

Your explanations are sooo clear! :)

[@mmahjoori]

Hi, Thanks a lot for your explanation, but I guess you are measuring directly the voltage of the AC source as you connected the red lines :)

[@DocSchuster]

+Majid Mahjoori Yes, but mustn't that also be the sum of the drops across the two elements at any given instant?

[@johnlin7056]

when you added the two voltages how come you didn't add the Y components but rather the magnitude of the vectors.

[@DocSchuster]

+John Lin I didn't add the magnitudes. I'm adding the vectors themselves, and then taking the y-component of each. That's equivalent to taking the y-components and adding them but more conceptually pleasant.

[@johnlin7056]

Oh alright thanks :)

[@Mrpidarable]

Please could you explain what is the x- axis? the direction?

[@za6551]

so is impedance in a form of resistance to only capacitor and inductor individually or not cause I'm confused

[@altuber99_athlete]

Around 4:38 "The SQRT of [...]" 😂

[@Llegando_Tarde]

Don’t understand much, how would I go avout learning more about lets say how speakers work? Is there a college course

[@AmrYouSSeFMuStaFa]

That makes sense ,, thank you !

[@israelayoade]

You'll be surprised how this popped up on my Texas Instrument interview

[@IzzyMonroe]

Most excellent.

[@kiriInvestigator4597]

Thank you sir. Much appreciated

[@IceyJunior]

Why do you always add an resistor in a pure capacitor or inductor circuit? I just dont get it

[@DocSchuster]

It would be silly to imagine that you do not have any inherent resistance in your circuit.

[@IceyJunior]

Resistor will dissipate the electrical energy as heat energy, making the circuit not efficient, isn't it doc? 🤔

[@KevPat199]

I am currently taking Physics 2, so I only have a weak fundamental understanding of physics. I am not completely sure that this is what happens, but this is what I think: Theoretically, if we have no resistor, the current would be infinite. The electrons would be moving so fast that the battery would not be able to keep up. Literally, within milliseconds we could have an infinite amount of Coulombs passing through a point (I = V/R, as our R gets smaller and smaller towards zero, our current would reach infinity). Now, this may be hard to imagine, but theoretically, if an electron is moving at an infinite speed, it can be at all places at once (within the circuit). However, in reality, we can never get or make any material to have zero resistance (probably because an electron can't be in two places at once). Therefore, to make the problem more realistic and avoid the theoretical anomaly I have just described (current = infinity if we have no resistance), we use a resistor.

[@prateekgurjar1651]

+Icey Junior, yeah it will make it not efficient. But the wires we use everyday are not efficient. If you just connect them to a battery they will heat up cuz of their own resistance. +Keval Patel YO RIGHT NIGGA

[@sarthak9609]

In simple words, more current = your house on fire. Shut up and thank Mr. Resistor

[@briansakala7721]

good work indeed

[@bonganesithole9107]

thank you very much sir

[@architrawat1493]

Ver good Video keep it up

[@borisnotley3169]

at @2.00 did he just say, "current though by diahrrea"?!?!?!

[@obieo3474]

sqwoooorrr

[@cdgt1]

Frequency goes Schhurrrrra!

[@ahmedezzat687]

Great

[@deckard5pegasus673]

why does he say "scroot" and not "square root"

[@wilsonlough8520]

scroooot

[@sheldonfernandes3588]

sqroot sqroot

[@bishopking2660]

2:00 ;)

[@wntu4]

diarrhea?????? lmao.

[@joeshults7749]

It's pronounced "squared" not "squerred" or whatever you are saying

[@ddee2501]

I am sqroot