Introduction to Phasors, Impedance, and AC Circuits

In this video I give a brief introduction into the concept of phasors and inductance, and how these concepts are used in place of waveforms.
Note: At 2:28 I should have said "the more COUNTER-clockwise of the two is the leader".
Animations made possible by 3Blue1Brown: / 3blue1brown
Tweeted about by 3blue1brown here: / 772904942365347840
Music is Downtown Serenade by Viikinsaari (betterwithmusic.com) CC BY: betterwithmusic.com/projects/v...

[@mazzadowe9204]

Aren't the diagrams the wrong way round for lagging and leading voltage?

[@crclayton]

Thanks for bringing that to my attention! The diagrams are the right way, but I did misspeak so that may have been unclear. At 2:28 I should have said "the more COUNTER-clockwise of the two is the leader". I've made a note in the annotations and pinned this comment.

[@bastienbourgault697]

Thank you I was looking in the comment section for a confirmation

[@veritasiumaequitasius3530]

Right, counterclockwise is positive rotation in trigonometry and most physics, etc. unless specified otherwise.

[@Julia-hs9og]

I came here and was like "Is this 3blue1brown?". Great video! Exactly what I needed to grasp the subject a bit.

[@SuperNewPirate]

You really made me understand my 2-hour course in less than 4 minutes.

[@march11stoneytony]

Thank you! So many poor videos online that fail to properly explain this in 20 minutes. Yours did it in 4 minutes.

[@Daniel123434ser]

This was the most intuitive video I've seen for under grasping phasor concepts, it was a nice refresher to me.

[@gatesjohns4960]

love to see the shoutout to 3B1B. love that channel. but also great to see someone continuing in his awesome style! and doing it well!

[@narutouchiha1946]

You described these concepts really well, and it was backed by some wonderful animations! Nice job, and shoutout to 3Blue1Brown.

[@OriginalOsO]

Just what I was looking for... accurate, precise, short explanation. Excellent job!

[@silverspin]

I had given up on AC entirely since high school, and came just to see formulas but holyy mother- i finally get it TvT

[@johnishikawa2200]

This is a superb video. I have not looked at material like this for many years - decades actually - and this little discourse brings it all back in a quantitative way.

[@cimachu]

AWESOME! You totally nailed both 3Blue1Brown's style, and his ability to explain a topic in a very easy to understand way. I've been watching lecture recordings on repeat for hours and they don't hold a candle to this 4 minute video.

[@ALLENGAO-qp7sw]

Explanation: 10. Music: 10. Overall Learning Experience: 10. Love the content, thanks for the immersive experience Charles ✌🏻

[@BenLam00]

Do more videos which go in depth on phasors please!! Its the first time I actually found a video on electrical this visually appealing :)

[@phildias]

Awesome job with the video, man. I ran away from electrical engineering because things like these scared the crap out of me. This video actually helped to make some of those nebulous concepts feel straightforward and intuitive. Thanks =) Keep up the good work!!!!

[@ivandeetlefs]

Your method of explaining is top notch. Great vid!

[@zailuanshuoyou955]

Excellent tutorial video, thousands of times better than my instructor’s explanation.

[@Lexyvil]

This is the best way to teach concepts. Thank you for using this style for teaching.

[@macmos1]

Please make more videos like this! I can definitely see you gain a following and supporters. Thanks for the video concise and informative, loved it.

[@yelectric1893]

Excellent. Thank you so much. You have made something great, inspired by something, but you pushed it through to the fresh field of engineering. Wow.

[@carsenvillegas7259]

Really like the use of the animation software that 3b1b uses

[@lucasmeira98]

amazing. subscribed. I'm an electrical engineering student. Love the 3b1b tool! Keep on doing this great work

[@smooooth_]

3b1b style EE videos is something I never knew I wanted until I saw this

[@gabriel_gelli]

Same feeling!

[@dakotahrivers6640]

It's so strange getting to this point in my engineering education (ENGR 202, nothing crazy yet) where before this point, all we knew was DC and capacitors and inductors were basically just abstract elements that we learned the mathematical properties of. But now in AC you can see what they do to a circuit! so exciting

[@Ndakala.Chaka314]

This was really really helpful😭😭thank you, and super interesting too, was looking for more videos on AC on your channel, but didn’t find any, wish you had more, you’re really good at explaining 😊thanks for this video super helpful you have no idea

[@diasmashikov7793]

I am begging you man to make more videos on this topic. I really like this work, and I hope you will continue because you help so much. Please

[@YaNke3S19]

best explanation on KZbin, awesome

[@kameelamareen]

3Blue1Brown , is that you ? EDIT: Just completed the video, amazing work !!

[@conorh4882]

same

[@nicfishman5194]

This was really interesting. I'm a physics student, so this take on circuitry was completely new to me. It's very cool, looking forward to more videos. One criticism: leave stuff on the screen longer. Just another .5-1seconds makes a lot of difference and allows a viewer to digest the content.

[@crclayton]

You're absolutely right. Rewatching this now, it's going way too fast. I recorded the audio first and at times felt rushed to fit the animations/equations in. In the future I'll definitely keep your feedback in mind!

[@ericsherwood160]

@@crclayton I actually recommend you not do that. The shorter video length makes it more tempting to click and most people just pause if they need a second to look. It's also very annoying when you already know a lot of it and you're waiting for the part you need but the picture won't change, especially when cramming before a test.

[@yelectric1893]

Simply rewatch the video 5 times :D .

[@Sweedster]

@@ericsherwood160 half a second to a full second isn't that much extra time, meanwhile it took me 3 tries to pause on the vector form of impedance lol.

[@t8821]

You, Sir are the beyond amazing!!!

[@karlie7]

Thank you for making this video! It's so helpful

[@koukydog]

Thanks a lot man, I love the animation and conciseness

[@joshuasusanto4258]

please do, i love this as much as Grant's videos. We need more videos like this and yours!

[@emilytran212]

THIS WAS THE MOST INFORMATIVE VIDEO EVER GOD BLESS SAVED ME PAGES AND PAGES OF READING

[@g6eliasee]

this guys giving off 3 blue 1 brown vibes...

[@timlagendyk]

This was super useful, please make more!

[@Electrical-Engineering-Notes]

"Empower the world with your spark of innovation, and let the current of your passion illuminate the path to a brighter, electrifying future in electrical engineering."

[@gabrielpulga6916]

Amazing video, thank you SO MUCH!

[@jennifery3036]

This is so helpful and clear!! Thank you thank you thank you!! 😭😭

[@10bokaj]

Super cool, I like that 3b1b' style

[@jhdslaufih]

Thank you so much, this video is superb.

[@morganhector4179]

This is the sexiest animation I've ever seen.

[@quantumwave1036]

We need more AC circuit videos!! Great video Btw (:

[@samarqureshi1524]

this is beautiful

[@nightlightreptile6314]

man this was soooo goood , thank you

[@Venaber]

very good video, thank you

[@eduardojreis]

Excellent video.

[@elijattack9621]

Great Background Music

[@carrefamily01]

great background music btw

[@davideplozner6693]

great video

[@ismailbinmail1956]

this video was so goooddd

[@tanchienhao]

just came across your channel! great stuff!! subscribed :)

[@421sap]

Thank you.

[@mardukevii9180]

Great video

[@mootassemhassoun3948]

Bravo!

[@kaitlinmeyer221]

OMG THANK YOUUUU!!!

[@adrianhaugland3806]

Thanks!

[@moe.jones1]

Amazing

[@sentient1640]

wonderful. thanks a lot. i mean it. :)

[@sohailjanjua123]

Hi Charles , I like your lecture

[@sohailjanjua123]

Hi Charles, Ilike your lecture

[@matthewwilliams7011]

nooooo where were the "future videos"? :( This was such a great video

[@ondrejvainer1510]

Nice vid. :)

[@stevenross6534]

Agree with the comment below, pls leave the animations on the screen longer so viewer can digest. Fantastic animations though. I'd drop the background music, I found it distracting.

[@hugeturnip3520]

thakn you so much

[@vivekprataprai2433]

Thanks alot 🙏

[@morezco]

awesome video. Did you use manim yourself?

[@salmagamal5676]

how did u explain this so smoothly?

[@user-cj9sv7gx5u]

Thank you for the video. I have a question, isn't impedance a complex number and not a vector value?

[@miguelguthridge]

Oh damn that's aesthetic

[@honestman276]

Thanks. From Bangladesh.

[@sohailjanjua123]

Hi, I like your lecture

[@FunOrange42]

i wish everybody copied 3b1b's style of videos. instead everyone's copying khan academy.

[@oanjenaldwrel3720]

charles is using manim, 3b1b's animation framework. but... yeah i agree. khan academy's format is trash.

[@cagataysunal1130]

well tbh this format requires more work

[@spearitscottie1]

I can't do Khan's constant repeating himself. Shit is too annoying to deal with

[@mysterium_99]

I like them both, Khan and 3b1b

[@edmondkeogh4057]

3b1b originally worked for Khan Academy so his style is just an evolved setup to theirs

[@Error404fucknickname]

What do you use to make this animations? Or did 3B1B make them?

[@crclayton]

I made them by writing them in python using the manim tool developed by 3b1b.

[@atharvas4399]

the amplitude of the phasor can be the peak values ; they dont have to be rms

[@sammezdoodles]

if the output of voltage of RL circuit is taken to be the voltage across the inductor, the circuit is said to be what

[@rodken314]

Your waveforms (two sine waves) are around the wrong way in your explanation of lagging and leading. The words and phasors are ok. For example at 2:23 when V is at its peak, I is yet to get there, so voltage is leading (by convention time is positive to the right) which is not what you intended. Similarly at 2:38 the waveforms depict lagging voltage.

[@atharvas4399]

3blu1brown style!!! how???

[@girishgarg2816]

Grant shared your video on twitter

[@aidanrabinowitz8155]

Do you work with 3Blue1Brown? Your videos use the same animations and music, so I was wondering if you guys helped each other out.

[@zizo-ve8ib]

1:42 why the complex plane specifically ?

[@activegrass9435]

hi sir im one of the final year students majoring in chemistry, just wanna say my gratitude for making this video, u just save my ass

[@wilsonwsyip]

I see that you represent the magnitude of your phasor using RMS value of voltage. I see in other literature that the magnitude is instead the peak voltage. Which one is correct?

[@afefbennanibenabdelghani9570]

In Electrical Engineering Context, the RMS value is often used to define sinusoidal voltages and currents..

[@jayconway1205]

I saw that too. What he actually showed was the peak to peak voltage and 0.707 times the peak to peak voltage. Vrms is 0.707 * Vpeak. Forget about peak to peak voltage. What we measure with a meter is Vrms.

[@abhijithmuthyala8838]

Can you please share the code for this ?

[@KAFKUBA]

Not sure why Xc is negative... the angle will take care of lag

[@JousefM]

Is the code for this open source?

[@MrAshley155]

Excellent video. Would love more videos that explain the calculations surrounding phasor triangles, please. I am doing a foundation degree in electrical engineering and there is a slight language barrier with the lecturer and note are not very clear. I have dyslexia and find learning from videos like this much easier to understand. If you have any recommendation please pm me. Ananimation to explain how a generator with delta and star connection for example. Thank you.

[@angelsintahoe]

Yeah, agree on having a calculations explanation part.

[@samirfakoua]

Wait when calculating impedance for capacitor don’t we still just add 1/jwc, every question I’ve done doesn’t subtract.

[@paulmoat7047]

The impedance of a capacitor is 1/(jwC). 1/j is equal to -j. Thus we can also rewrite it as -j/(wC).

[@intheskymusic]

wow

[@alexkorinth6459]

I took Circuits 1, and no one ever told me about electric signals or phases. Now I have to know what these are for Energy Conversions class. Now I have to search the internet far and wide for what anything is.

[@jimhenderson2308]

It’s helpful to think of passive electrical circuits in the context of the duality of nature. I. e. electricity and magnetism. The charged capacitor stores energy in the form of an electric field or E field. The current conducting inductor stores energy in the form of a magnetic field or B field. It’s important to realize their steady state behavior in circuits powered with DC power source as follows. Inductor behaves primarily as a short circuit. Capacitor behaves primarily as an open circuit. It’s when their AC behavior is observed and studied in the time domain that phasers are introduced for analysis purposes.

[@nishant1088]

Make more videos !!

[@joshuasusanto4258]

as a math lover; my first reaction to EE's "j" for imaginary numbers was whyyyyyyyyyyyyyy

[@macmos1]

I come from a math/physics background and have been diving into electrical engineering for a while. At first I absolutely hated the 'j' notation, but I've grown accustomed to it. Now I actually prefer it because I think more in terms of circuits, AC, and EE. It helps to keep a distinction and I only use 'i' for strictly mathematical things like fourier transforms and such.

[@noorayesha7821]

But why we need to take complex numbers here??? can't we just do it with Cartesian XY Plane and without using complex numbers ??? what are the advantages and the intuitions ???

[@macmos1]

It makes calculations easier if you understand it.

[@macmos1]

for example you can represent everthing in terms of e^(itheta)

[@prattstick1519]

physics 3blue1brown

[@abdullahalmasri612]

I know this is late but I feel like keeping text for a bit longer and pausing could have been nicer

[@kuijaye]

Use \sin{2\pi...} in Latex

[@circuitsolver9885]

Hello could you test this software? come upon androidcircuitsolver on google

[@harys6382]

why root 2.

[@joeo3377]

Voltage and current are scalars. While "phasor" is short for "phase vector," the phasor is actually a complex number, and complex numbers are scalars, not vectors!

[@girishgarg2816]

Please share code on github

[@Cherub-vl9bc]

i could say those were at least 20 min

[@CASE-vc3fm]

Hi! Very good explanation, but I think you're are explaining it a bit too fast, other than that thanks.