Lect08 - Physics 212 Lecture 8 Today's Concept Capacitors...

Info icon This preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 212 Lecture 8, Slide 1 Physics 212 Lecture 8 Today's Concept: Capacitors Capacitors in a circuits, Dielectrics, Energy in capacitors
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physics 212 Lecture 8 Music Who is the Artist? A) Ricky Skaggs B) Jerry Garcia & David Grisman C) Tony Rice D) Steve Earle E) Mike Marshall & Darol Anger Theme of the Week: Mandolin Players Extraordinaire Young (Chris Thile) & Old (David Grisman)
Image of page 2
Physics 212 Lecture 8, Slide 3 Some Exam Stuff Exam next Wednesday at 7:00 (Sep. 21) Covers material through lecture 8 Bring your ID Conflict exam at 5:15 – sign up in your gradebook by 10:00 TONIGHT If you have class conflicts with both of these, please email Dr. Park ( [email protected] ) by 10:00 tonight. Where do I go? EXAM ROOMS (by discussion section) Preparation: no in class review :( Practice exams Worked examples Exam Preparation Exercises Extra Office Hours
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physics 212 Lecture 8, Slide 4 Your Comments 05 i thought i understood till the 2nd and 3rd checkpoints” Please, explain last checkpoint question (capacitors with and without a dielectric). Everything else was fine :) WILL DO See Calculation at End Will Do.. They were the hardest It seems like a lot of variables are inverses of each other... Can you clarify on this? An overview would be very helpful. How do different situations (e.g. capacitors in series, parallel, presence of dielectric, etc.) affect the charge, voltage, and energy of the circuit. ” “It's hard to keep all of the symbols and letters separate, and even harder to remember the "special cases" when variables stay they same or are changed.” I would like to go over some more examples with different types of capacitors set in circuits with both parallel and series connections.“ Detail detail detail, and some worked calculations would be “ We’ll summarize main points. “I worry that I have reached the capacity of my brain, I guess I can forget Chem to make some room.”
Image of page 4
Physics 212 Lecture 8, Slide 5 C V + Q -Q Q Q This “Q” really means that the battery has moved charge Q from one plate to the other, so that one plate holds +Q and the other -Q . C V Q=VC Simple Capacitor Circuit 8
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physics 212 Lecture 8, Slide 6 By adding a dielectric you are just making a new capacitor with larger capacitance (factor of κ ) Dielectrics C 0 V Q 0 =VC 0 C 1 = κ C 0 V Q 1 =VC 1 11
Image of page 6
Physics 212 Lecture 8, Slide 7 V Q 1 = C 1 V Q 2 = C 2 V C 2 C 1 Parallel Capacitor Circuit Key point: V is the same for both capacitors Key Point: Q total = Q 1 + Q 2 = VC 1 + VC 2 = V(C 1 + C 2 ) C total = C 1 + C 2 Q total Q total 14
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physics 212 Lecture 8, Slide 8 Series Capacitor Circuit Q Q Q +Q +Q -Q -Q V C 1 C 2 V 1 V 2 Q V Q Key point: Q is the same for both capacitors Also: V = V 1 + V 2 Q=VC total Key point: Q = VC total = V 1 C 1 = V 2 C 2 Q/C total = Q/C 1 + Q/C 2 1 C total 1 C 1 1 C 2 + = 17
Image of page 8
Physics 212 Lecture 8, Slide 9 Checkpoint 1 C C C C C 1/C total = 1/C + 1/C = 2/C C total = C/2 C total = C C total = 2C Which has lowest total capacitance : 18
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physics 212 Lecture 8, Slide 10 Checkpoint 2 C total = C Which has lowest total capacitance: C C C C C C left = C/2 C right = C/2 C total = C left + C right C total = C 20 Same
Image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern