21.1 RLC Circuits | General Physics

Chad provides a comprehensive lesson on RLC circuits which have a resistor, an inductor, and a capacitor in series with an AC generator. The lesson begins with a discussion of resistors in AC circuits and how power is dissipated when current flows through a resistor in either direction. The voltage across and current through a resistor are in phase. With the change in direction for the flow of current in a circuit, the average current in the circuit will be zero as will the average voltage. The rms voltage and current are introduced which are a sort of average which can be used to calculate the power dissipated in resistor in an AC circuit.
Capacitors in AC circuits are discussed next. The voltage across and current flowing around a capacitor are not in phase as the voltage lags the current by 90 degrees. The effective resistance associated with a capacitor in an AC circuit is called the capacitive reactance, the formula for which is presented and discussed.
Inductors in AC circuits are discussed next. The voltage across and current flowing through an inductor are not in phase as the voltage leads the current by 90 degrees. The effective resistance associated with an inductor in an AC circuit is called the inductive reactance, the formula for which is presented and discussed.
RLC series circuits are finally discussed, the effective resistance for which is termed the impedance. Chad introduces phasor diagrams which are useful for calculating the voltage and impedance of an RLC series circuit since the voltage across a resistor, inductor, and capacitor are not in phase. As a result, the voltage output of the AC generator in the circuit is not simply the sum of the voltage across the resistor, inductor, and capacitor. The phase shifts relative to one another must be factored in, and the phasor diagram facilitates this. These voltages are added as vectors, and the formula for the maximum voltage is presented. The phasor diagrams can also be used to calculate the overall impedance of the circuit in similar fashion as the vector sum of the resistance of the resistor, the inductive reactance of the inductor, and the capacitive reactance of the capacitor.
Finally, Chad shows how to calculate the resonance frequency of RLC series circuit as well as the power dissipated across the resistor, taking into account the phase angle between the rms voltage and rms current. Several sample problems are solved.
00:00 Lesson Introduction
01:05 Resistors in AC Circuits
02:32 RMS Voltage and RMS Current in AC Circuits
06:23 Capacitors in AC Circuits (Capacitive Reactance)
10:53 Inductors in AC Circuits (Inductive Reactance)
15:18 RLC Series Circuits (Impedance)
23:29 RMS Voltage and Current Calculations
25:55 RLC Circuits Calculations
Check out Chad's General Physics Master Course: courses.chadsprep.com/courses...

[@Heyyyyyy870]

I’m taking physics in the summer and I already have the physics playlist!!!! I will also study for the MCAT with you in hopes of taking it early next year. Thanks Chad.

[@ChadsPrep]

All the best for your educational endeavors!

[@kileyadams3831]

go chaddy daddy go, your physics videos are where its at

[@ChadsPrep]

As always, Thank you!

[@AnnabellaDuong]

Hey Chad, I see in your physics master course that chapters 21.3-21.6, 22.2-22.5, and 23.3-23.8 were all removed in your "Updated Physics Video Series" and in the course. Do you know why they are no longer taught in your new curriculum, and if you will make updated videos for those chapter sections, or will we have to only look back at your old videos?
Furthermore, do you know if you if it would be possible for you to cover Chapters 27 (Quantum Physics), Chapter 28 (Atomic Physics), and Chapter 29 (Nuclear Physics) in College Physics 2? Thank you so much in advance!

[@ChadsPrep]

Hi Annabella! I restructured the curriculum a little bit. Instead of several shorter lessons, I combined all of the material in chapter 21 into just 2 longer lessons. I also combined all the chapter 22 lessons into a single long lesson (it was just more cohesive) and then moved the lesson on the polarization of light to the end of chapter 24. Next, I have combined the curriculum for Quantum Physics and Atomic Physics into a single chapter which will be released this week. Lastly, I had not planned to produce a chapter on Nuclear Physics, but I'll give it some more thought. Happy studying!

[@sadiahazad7276]

Hi Chad, I just bought access to your Physics Master Course. I noticed that Chapter 19 videos and study guide has not been uploaded and Chapter 21 videos haven't been yet posted. I was wondering when these would get uploaded? I would like to follow along with my class. Thank you!!

[@ChadsPrep]

My bad, I uploaded chapter 19 but had the videos set to 'draft' so they weren't visible. You should see them now and chapter 21 should be up later today.😊

[@muqunentvchannel3192]

My brother is currently profesor in USA physics department

[@muqunentvchannel3192]

Love u from Pakistan

[@ChadsPrep]

Thank you from USA.

[@KhanKhan-vm6np]

From Pakistan ur student for a 2 year or so

[@ChadsPrep]

Welcome to the channel.