Electrical Networks: Voltages and Currents

[@ogk129]

As a learning apprentice electrician. This is eye opening holy shit. I love electricity it is so cool.

[@JoaoLojaPereira]

Thank you! Wish that in my days i had teachers of this caliber. Would have made things much... much easier.

[@JDBolt1958]

Awesome! The complex impedance term has i in the numerator, it is shown in the denominator here. The minus sign comes from 1/i is minus i.....subtle important part! this leads to the concept of phase.....video gets fun when Prof Strang introduces incidence matrix and nodes!!!!!

[@jewbacha1137]

7:22 It's just like magic!!!!

[@Mrpositiveelectricity]

😍😍

[@marverickbin]

Wow. Best electric engineering class I had. Finally understand impedance. So, the amplitude of impedance is the gain of the circuit. There is any parallel of impedance in the mechanical mass/damping/spring system? Thanks

[@atomskyjahid1533]

So, RLC circuits were actually used for solving 2nd order DEs! Much wow!!!

[@jdragon8184]

yeah 😂😂😂 its awesome but somehow its funny

[@kabandajamir9844]

So nice the world's best teacher

[@VarunMehrishi]

Minor mistake - not math related. In the video the symbol for the capacitor looks like a constant voltage source. The bars should be of equal length in a capacitor. Many thanks to Prof. Strang and OCW for such an interesting differential equation series.

[@Bhakti_dwar11968]

but a capacitor just supply voltage and it is self understood...

[@xayanwelsh]

Maybe he tried to draw a polarized capacitor lol

[@eli25jk70]

graduated 6 months ago. I dont miss even a sec of this crap.

[@marvinmartian8746]

LOL! I guess I can't blame you. I graduated (EE major too) 31 years ago and miss it like crazy. I took a different career path after college, so I never put it to use and my brain doesn't work like it use to. I'd love to learn it all over again.

[@celerystalk1521]

graduated 15 years ago. watching it for fun.

[@manasaveenapadma2236]

At 05:48 he compares electrical with mechanical engineering, Resistance with Damping, Inductance with Mass and Capacitance with Stiffness. I couldn't get that completely, I am from electricals background, it would be great if you could give explanation or reference to those analogies. 😃

[@jassimjaved3309]

Compare an RLC circuit to the motion of a mass in a mass-spring system. In an RLC circuit, current oscillates between L and C depending upon the value of R analogous to the mass which oscillates back and forth along its mean position. Duration of motion depends on many factors including friction. So friction is analogous to resistance. If L and C is more, the natural frequency of an RLC circuit will be less. Similarly if the mass of the body is more and if the spring is stiff then the mass attached to the spring will not oscillate at a high frequency.

[@trilexfix]

gotta take the perquisite lol

[@abrahamlincoln4894]

0:56 that's not the capacitor symbol

[@cctang4922]

The transient state solution was omitted in the video.

[@zawadniyonkuru822]

I live in rwanda country I want where your school's located i LOVE electronic and electrical

[@marufahmed6459]

Hello! I surmise Prof. Strang's former colleague Walter Lewin and othe fellow physicist would actually disagree with him about invoking Kirchhoff's KVL here; as the flux here is constantly changing. It precisely is an application of Faraday's law. I hope MIT OCW authority will take a second look here and amend it ASAP. :)

[@Rayquesto]

Maruf Ahmed But there's no electric or magnetic field applied into the loop? That would be a matter of conservative flow... and because there's no external field applied to the loop, I would assume that flow is conservative with the "eularian" flow term goes to zero. I know what you're talking about and I've seen it, but I don't think Lewin meant that the eletrical engr curriculum was missing something large... just that they never bring it up in the case of non conservative flow (assume it's all conservative).

[@BigDaddy-mh3ry]

Maruf Ahmed apply maxwell equation. There was no external magnetic field.

[@zawadniyonkuru822]

Which country you lived professional

[@vikaschowdary527]

We can consider lumped matter discipline where we will assume that the change in magnetic field is zero and there is no charge build up in the circuit and circuit operation is way less than speed of light and if we talk in power systems perspective we want to use Maxwell eqns to solve for transmission line transients

[@oldskoolordie]

Meanwhile you could just connect an ammeter across the switch to measure it.

[@Labroidas]

He's mentioning that when he's saying that an analog computer would do exactly that: solve the equation by measuring.

[@freshramses]

powerful stuff

[@stefanie0158]

I studied this in high school

[@2bookoo4u]

This is basic stuff. Is all of the free ware stuff like this?

[@SheikhEddy]

At 9:40, where did the negative come from?

[@SheikhEddy]

Oh, it was fixed at 12:25.

[@danielkinyanjui5296]

Strunng!!

[@comingshoon2717]

crack

[@292renaldo]

Wow had me lost

[@zackmorris4977]

Professor is terrible 😔

[@rajdeepsingh26]

He is a legend