# AT Cycle 21

## 1/16 - 1/19

T 1/16

W 1/17

Th 1/18

F 1/19

### 🔴 2: W 1/17a, 🟡 4: T 1/16, 🔵7: T 1/16 - 1F capacitor lab (2)

Last time, we learned about how to use a breadboard to build a circuit. Today, we'll actually build a practice circuit using the 1F capacitor. You will have to pick your own value for a charging/discharging resistor. Then, using the data you collect using browser-based Vernier Graphical Analysis App (accessible through ClassLink), verify the time constant with two different methods. Evaluate which method you think would be better.

Equipment: breadboard, wiring box, resistor of your choice, 1F capacitor, DC power supply, Vernier Go Direct Voltage probe, Vernier Go Direct Current Sensor probe (check what you think the max current will be in your circuit in order to set the precision switch), computer with browser-based Vernier Graphical Analysis App (accessible through ClassLink).

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

Required: 2007E1 (submit with first problem set next week)

Safety Precautions:

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

Be mindful of the polarity of the electrolytic capacitor. Remember that on the 1F electrolytic capacitor, the negative end has the stripes.

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

Turn off the power supply when you are not actively taking data.

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.

### 🟥❗ 2: W 1/17b, 🟨❗ 4: W 1/17, 🟦❗ 7: W 1/17a - One Farad Capacitor Lab (3)

Quiz on equivalent resistance (combo circuits) & Kirchhoff's Laws

Electrostatics Optional Remediation TODAY!

Today, we'll continue the 1F capacitor lab above.

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

Required: 2007E1 (submit with first problem set next week)

If you finish early, you may start the Mystery Capacitor Lab in the next post.

Handout: Mystery Capacitor Lab

Homework: QUIZ Tuesday, January 23rd on derivation of charging and discharging equations. If you have not done so yet, finish pages 1-2 of Mystery Capacitor Lab and plan out how you're going to conduct the next part of the experiment outlined on page 3. Read sections 27-3 & 27-4 in your textbook if you have not already done so.

### ❤️ 2: Th 1/18, 💛 4: F 1/19a, 💙7: W 1/17b - mystery capacitor lab (1)

Today, we will finish the one-farad capacitor lab, and I will verbally assess your understanding of the analysis.

Then, we'll work on the Mystery Capacitor Lab to use what you know to see if you can determine unknown quantities in an RC circuit. Make sure that you read the handout very carefully and explain everything! Your grade will largely be based on your ability to EXPLAIN what you did. In this lab, we want to avoid trying to use just one or two data points to determine the values of the mystery capacitor and mystery resistor. Why would this be a bad idea? How can you use all of the hundreds of data points that you collected to get the best answer? Use the power of Vernier software to help you solve this.

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 and turning on the power supply.

Turn off the power supply when you are not actively taking data.

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 (do before quiz, but submit with first problem set next week)

Handout: Mystery Capacitor Lab

Homework: QUIZ Tuesday, January 23rd on derivation of charging and discharging equations. If you have not done so yet, finish pages 1-2 of Mystery Capacitor Lab and plan out how you're going to conduct the next part of the experiment outlined on page 3. Read sections 27-3 & 27-4 in your textbook if you have not already done so. Finish your lab and the above AP problem if you did not in class. If you still don't know the physical significance of the time constant "RC", look it up! It's important! Watch the video on Dielectrics in Capacitors below, although it should be review of what we have already talked about in class, so at least skip through it.

### 📕 2: F 1/19, 📒 4: F 1/19b, 📘7: Th 1/18 - mystery capacitor lab (2)

Finish the Mystery Capacitor Lab this class and hand in your packet by the end of the period.

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

Required: 2007E1 (to do before quiz, submit with first problem set next week)

Homework: Read sections 27-3 & 27-4 in your textbook if you have not already done so. Finish your lab and the above AP problem if you did not in class. If you still don't know the physical significance of the time constant "RC", look it up! It's important! QUIZ Tuesday, January 23rd on derivation of charging and discharging equations.