But it wont affect our final answer basically when we

Info icon This preview shows pages 9–14. Sign up to view the full content.

View Full Document Right Arrow Icon
But it won’t affect our final answer. Basically, when we chose our current directions, we chose a coordinate system, I 1 happened to go in the negative direction. We now know the true direction of I 1 .
Image of page 9

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

View Full Document Right Arrow Icon
RC Circuits Up until now, you have only had capacitors or resistors as our circuit elements, but what would happen if we had both? The simplest such circuit is: What will happen when the switch is closed? A current will start to flow through the resistor and the capacitor will begin to charge. Charges from one plate of the capacitor will flow to the other.
Image of page 10
RC Circuits Will the current be constant? No, as more and more charge build up, the current will slow down until it becomes zero. This means that the current, I, is time dependent. The charge, Q, on the capacitor plates will also be time dependent. As time progresses, the charge will increase until it reaches some final value, Q f .
Image of page 11

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

View Full Document Right Arrow Icon
RC Circuits Perform a Kirchoff loop over the circuit to find Q f . When the capacitor is fully charged, the current, I, will become zero.
Image of page 12
RC Circuits But if we would like to find the charge on the capacitor plate at any time, t, we have to perform some math. This is a differential equation, the solution is (to find Q for a charging capacitor): The capacitor charges exponentially as a function of time. ! ! dQ dt R ! Q C = 0
Image of page 13

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

View Full Document Right Arrow Icon
For Next Time (FNT) Start reading Chapter 28 Finish working on the homework for Chapter 27
Image of page 14
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