# AT Cycle 21

## 1/17 - 1/20

T 1/17

W 1/18

Th 1/19

F 1/20

### π΄ 2: W 1/17a, π‘ 4: T 1/17 - time-dependent RC circuits

Today, we'll learn what a capacitor does when it's in a circuit. This PhET simulation will assist with our investigation. We will compare and contrast a capacitor with a battery. Then, we'll use Kirchhoff's Laws to determine an expression for the charge of a capacitor as time changes.

Then, we will collaborate to understand Jon Ting's video by forming heterogeneous groups/pairs to ensure everyone understood the derivation. NOTE: When Jon Ting talks about the "area under the curve," he made a mistake - it's not area under the curve. Try to make sense of it without thinking about area.

Homework: Read sections 27-3 & 27-4 in your textbook. Rewatch Jon Ting's video.

### π₯ 2: W 1/17b, π¨ 4: W 1/17 - capacitor pre-lab

Today, we'll practice the derivation of the charge on a capacitor over time (charging and discharging) as well as the currents over time. Submit a picture of your work to βοΈ Google Classroom.

Then, we'll complete Capacitor Pre-Lab in β Formative.com utilizing what you learned from South alumnus Jon Ting's video on how to use Kirchhoff's Laws to determine an expression for the charge of a capacitor as time changes.

Homework: Quiz on equivalent resistance (combo circuits) and Kirchhoff's Laws Friday, January 20th. Submit a picture of your derivation of charging and discharging equations in βοΈ Google Classroom by tonight Wednesday at 10pm. If you did not finish the pre-lab in β Formative.com above, do so by Wednesday at 10pm. Watch the following videos on energy stored in capacitors. They are similar with slightly different approaches.

### β€οΈ 2: Th 1/19, π 4: F 1/20a - breadboard

Today, start a lab to learn about the circuits equipment we have available to us in order to measure the voltage and current "through" a capacitor. In particular, you'll learn how to build an RC circuit with a 1F capacitor breadboard. This is a warm up for your big formal lab next lab period, so make sure you understand this one!