# AT Cycle 23

## 1/23 - 2/3

F 1/28

M 1/31

W 2/2

Th 2/3

### π΄ 1: F 1/28, π‘ 3: F 1/28 - mystery capacitor lab (2)

QUIZ Today on derivation of charging and discharging equations (marking period 3).

Today, we'll try to finish the Mystery Capacitor Lab. Pages 1 and 2 should already be complete, and you just need to build the circuits and find the values of the mystery capacitor and resistor.

Safety Precautions:

• Have the teacher check your circuit before connecting the power supply.

• Be mindful of the polarity of the electrolytic capacitor. The notch is on the positive end.

• Make sure all the knobs on the power supply are turned all the way counterclockwise before plugging in the power supply.

• Be sure to NOT touch any of the exposed wires in your circuit while you are running your experiment.

• Discharge your capacitor shortly after charging it to reduce the amount of time where you have a large amount of charge on your capacitor and to leave for adequate time for full discharge. In general, minimize the time that you have an active circuit.

• Make sure to discharge your capacitor fully before dismantling your circuit.

• At the end of the lab, unplug your power supply and place the plug on top of the power supply so I can see from across the room that it is unplugged.

Then we'll do one problem to check for understanding.

Required: 2007E1

Handout: Mystery Capacitor Lab

Homework: Watch this video on energy stored in a capacitor:

### π₯ 1: W 2/2 lab, π¨ 3: M 1/31 lab - RC circuits problems (1)

Today, to check your understanding of the previous mystery capacitor lab, do the following problems:
Required: 2007E1, 2013E2, and Chapter 27 #59 & 60.

Then, rather than focusing on how capacitors charge and discharge over time, we'll think about what happens immediately after the switch is closed and a long time after the switch is closed. For additional support, watch the following 3 videos.

Remember that an uncharged capacitor acts like a wire and a fully charged capacitor acts like an open circuit. Then think about using Kirchhoff's Loop Rule to solve the rest.

Then, we'll work on a few AP problems involving RC circuits. These are learning problems, so we will be learning and deepening our understanding of capacitors while we do problems.

Required: Ch 27 #61, 63, 65, 67, 79, 80, 2007E1, 2006E2, 1996E2, 2010E2
Enrichment: Ch 27 #66, 69

We will continue these problems next hour.

Homework: Upload pictures of your solutions the four AP problems above in βοΈ Google Classroom by Friday at 10pm.

### β€οΈ 1: Th 2/3, π 3: W 2/2 - RC circuits problems (2)

Today, we'll work on a few AP problems involving RC circuits. These are learning problems, so we will be learning and deepening our understanding of capacitors while we do problems.

Required: Ch 27 #61, 63, 65, 67, 79, 80, 2007E1, 2006E2, 1996E2, 2010E2
Enrichment: Ch 27 #66, 69

Also, after learning a little more, I would like for you to revisit the "Tricky Challenge" from the β GoFormative "Capacitor Pre-Lab". There's a new assignment in β GoFormative called "Capacitor Pre-Lab Revisited" which is also due on Sunday at 10pm.

Homework: Upload pictures of your solutions the four AP problems above in βοΈ Google Classroom by Friday at 10pm. β GoFormative "Capacitor Pre-Lab Revisited" also due on Sunday at 10pm.