RC Circuits - Review for AP Physics C: Electricity and Magnetism

Content Times:
0:00 RC Circuit Basics
4:01 Limits
6:35 Charge as a function of time
14:09 Current as a function of time
16:40 Stead-state
17:29 Time Constant

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Previous Video: Kirchhoff's Rules of Electrical Circuits

#APPhysicsC #RCCircuits #TimeConstant

[ethanmoilanen]

Thank you so so much for the hard work you put into these videos and trying to get these vids out before the exam. I know they take forever to make but the niche community of AP Physics E&M students really appreciate it!

[yinvara]

You put in so much work it's criminally underrated. I share when I can

[OkOk-ugct]

Thank you for these videos, very much appreciated. Lots of love towards the team

[RoRo-weev]

dude i love you T_T, hope you're aware how great you are

[nglmirb]

4:08 why do we charge a capacitor through resistor?

[johnnichols]

I usually teach "a long time later" as meaning 5-10+ time constants, since 5RC gets the circuit 99.5% of the way to its final value. But you haven't discussed time constant yet, so this seems absolutely fine in this case.

[eljison]

Good job! I didn't realize that we could use "asymptotes" as a verb. I guess it is easier than saying "asymptotically approaches". Does the AP Physics C include realistic batteries (with internal resistance), or account for having more than one resistor in the circuit? We include them in University Physics courses.

[johnnichols]

Nice! I usually have students ask about the absolute value in the integral of 1/x and why we don't use it in this derivation. Do you normally address this when going through this for the first time?

[drkaplan]

The derivation does not deal with the absolute value ln|x+a|. I note that most people who present this leave it out, but it needs to be addressed. In this case x (or q) is ALWAYS less than a (or Eps C), so the items inside the absolute the absolute value are always negative. Therefore, the ln|x-a| = ln(a-x). Therefor the integral is in face ln(a/x).

[ronaksamani]

Fantastic. Will you do one for RL Circuit?

[mikeytodorov]

@20:18 did we just get some flipping lore??

[skylerpretto]

I wish more physics videos had Doors references. 😛