Full 1 Hour Video AC Circuits: www.patreon.com/MathScienceTutor Direct Link to The Full Video: bit.ly/3vEFYjI Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html Final Exams and Video Playlists: www.video-tutor.net/

Last minute cramming. Fell asleep right at the end. Woke up to a loud af chicken nugget commercial. This is my life now.

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This simplified what my teacher overcomplicated. I appreciate how concise and simple you made all of this

Dude, you're a genius. I planned to skip these questions in my upcoming FE exams but then I decided to watch your video and lo and behold, you've made it so easy. and even explained what's not in the question. Thank you.

Got an Electrical engineering midterm in 24 hours. Thank You 🙏

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I have learned more from the organic chemistry tutor than I have in any lecture hall.

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Problem at 4:30--the current cannot decrease exponentially as stated when the switch is opened because open switch = open circuit = zero current, leading one to conclude that current decreases to zero instantaneously. In practice, as current decreases at a very high rate when switch is opened, di/dt is very high, energy stored in coil's magnetic field is discharged into circuit at a very high rate, a very high voltage is developed in the coil opposing the drop in current, that voltage opposes the battery voltage and is many times higher, and the air between the opening switch contacts is ionized, allowing a spark of current to flow in the direction opposite to the original current to dissipate the power supplied by the inductor. You have here the basis of the battery-powered automotive ignition circuit.

You saved my degree. I am forever grateful.

Nicely Explaination

Another great set of examples helping us to understand the intricacies of these calculations. I don't yet understand how capacitors and inductors differ in their purposes for a single circuit. When do you use one or the other for a single circuit and why?

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he said LR rather than RL but still managed to understand what a guy

I have whole elcetro mechanics in back log and i have exam on this Friday today is tuesday. I gonna put my bet on you.

Nice, which app does he use to make this videos?

Can I calculate the energy stored in a coil without having the current?

Exam in exactly 24 hours, I’d say I’m on the lower end of procrastination compared to some here, but I had to spend the last 5 days Nodal, Mesh, Linearity, Max Power, Thevenin’s, Norton’s, Source Transformation, Op-Amps, Capacitors, RC Circuits (still working on getting that down) because I took this entire semester for granted aaaand now I’m here. Wish me luck lmao

Thanks!

thank you so much

For #1, we used the I equation which represents current increasing, the 1-e one, but we got a +EMF which tells us that the current in this circuit is decreasing?

Yo I had no idea Mark Wahlberg was so good at Physics. All kidding aside, your videos are dope and have really helped me.

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Plz add videos for rl rc and rlc transients for dc excitation..

Thank you 😊

Awesome

For the second problem... Why do we use 0.174A as our current while we said it changes? Should we not use the max current driven by the battery?

16.31 So our final answer for part a should have had a negative even though there wasn't one in the equation?

It helllllps a lot thankyousosososomuch

How did we come up with the formula to find the current after so many seconds?

My exam is tomorrow. Wish me luck guys!

What happened to part d at the end?

question: how does it work if im trying to figure the time for the current to reach its maximum value since you can't natural log 0?

@"The Organic Chemistry Tutor" - Can you possibly explain me one thing that I find hard to understand. Lets say we have an inducting coil, but it is make of a super-conductor. We fill that super-conducting coil with current and store energy in magnetic field that is created. We unplug the coil from the current source and current flows forever, because there is no resistance. Now comes the difficult part I don't understand: since now energy is stored in a magnetic field, and stored energy is a state of higher potential, wouldn't be normal to expect magnetic field to want to collapse back to zero and in process coil current will fade away to zero, as well? Essentially, never mind that resistance in super-conductor is zero, the magnetic field would want to collapse, regardless of what resistance is, because it's on a higher potential?

how can you get 0.472A and what is the value of e?

What happens when you replace the Voltage source with a capacitor and a flyback diode? Can you model such a circuit using math?

the -ve signs in 7.28V 4.72V are totally wrong. If the L is replaced by R2 will u get -ve voltages as well?

Thanks

God bless you

I think based on your orientation of + and - on the voltage drops of the passives that your sign was wrong. Just a thought I could be wrong as well.

And basics of transients

Gud explanation but audio is low

my new best friend

at part d) is there another way how to calculate the voltage across the inductor?

Am I wrong or could you have solved the 99.4% by setting the 1-e^(-t/~) =.994 then do the natural log?

we said that the inductor doesn't dissipate power so why can we find the value of the power here???

3:34 how do you put that on a calculator and got 0.472 amps? I got syntax error.

the equation used at 3:20 is wrong when the circuit is open the is no 1-e the 1 is obsolete

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Man, I still don't understand this. I wish your vids had more complex and useful problems.

you made a mistake in question d. it says that "at what rate" but you solved directly the power

9:59 hahah feel you bro

What does the "e" mean? Ln?

RL circuit time domain When a magnetic field inside a solenoid varies with time, a curly non-coulomb electric field is observed both inside and outside the solenoid. A coulomb electric field results and we note that an attempt to change the current in the coil induces an emf in the same coil and makes the coil sluggish to respond to current changes. Electrostatics and circuits belong to one science not two. To learn the operation of circuits it is instructive to understand Current, the conduction process, resistors and Voltage at the fundamental level as in the following two videos: i. kzfaq.info/get/bejne/irqkp5Vpx5fIiaM.html and ii. kzfaq.info/get/bejne/bqiBgMKp3Ji2lqM.html It is not possible in this post to discuss the production of induced emfs in inductors in detail. The last frame References in video #1 lists two textbooks 3 and 4 which discuss in detail with a series of sequential diagrams the physical processes to explain the operation of inductors and RL circuits. RL circuit frequency domain The existence of a sinusoidal current resulting from the application of a sinusoidal voltage to an inductor is a characteristic of the non-Coulomb electric field that is proportional to the rate of change in current causing a changing magnetic field. The current is a result of an opposing Coulomb electric field, which is a result of polarization by the non-Coulomb electric field associated with the changing magnetic field, and the current is a consequence of the resultant field of the applied field and the Coulomb electric field in the inductance coil. Inductors find applications as filters in power supplies and in resonant circuits in tuned amplifiers. If we increase the “frequency” of the input voltage to an inductor, the “rate of change” of the input voltage and the applied field is “greater than” the rates obtained with applied voltages at lower frequencies. At low frequencies, this causes a smaller induced opposing electric field and emf, therefore, large currents will flow within small intervals of time in the coils of the inductor. In the limit, if the input is a dc voltage, the current will become so large that the inductor will burn out. In an inductor, the opposition to the applied voltage which is changing the current is instantaneous and so, the current can only follow after the applied field has overcome the opposing emf. In an inductor for sinusoidal currents, the current lags the voltage by 90 degrees if the inductor is pure, and less if a resistance is in series with it; the inductor fights before current flows. If an inductor weren’t to fight, you will get energy for free! Low pass filters are built using L-R circuits in simple applications. Therefore, we say the inductor “blocks high frequencies” and acts as a “short circuit” at low frequencies as if the inductor was not there but a wire. It is not possible in this post to discuss in more detail current in inductor circuits and inductive reactance with sequential diagrams (textbook 4, see below). The last frame References in video #1 lists textbooks 3 and 4 which discuss these topics in more detail using a unified approach and provide an intuitive understanding of reactance.

It seems that in exercise 2, your answer didn't answer the question (d)

I watched it.

Big day today

for the time constant i got 0.02

I come up with a conclusion. 1. A teacher bad at teaching is not your fault. 2. If you failed to study ahead before your class is your fault. -------------------------------------- If you will have both conditions, it would be great. However, not everyone is lucky to get 1. but here is the organic chemistry tutor.

It would be better if the text is removed

14:16

god

Thanks!