Chat with us, powered by LiveChat Measuring capacitance Lab 8 - Measuring capacitance | Wridemy

Measuring capacitance Lab 8 – Measuring capacitance

Measuring capacitance Lab 8 – Measuring capacitance

Measuring capacitance

Lab 8 – Measuring capacitance

Capacitors are useful circuit elements because they can store charge. For a capacitor, there is a fundamental relationship between the applied voltage and the amount of charge stored on the capacitor. In this experiment you will measure the charge on a capacitor versus the applied voltage for several values of the applied voltage. A plot of charge vs. applied voltage should form a straight line with a slope equal to the capacitance.

Equation

 

(1)

 

You will use this relation to measure the capacitance of capacitors with different areas and distances between plates. Then you will verify the relation below using these different values.

Equation

(2)

 

Equation

objectives

· Determine the mathematical relationship between charge, applied voltage, and capacitance.

· Determine the capacitance of a capacitor.

· Verify the theoretical formula

 

MATERIALS

Computer w/ internet access

Logger Pro or Excel

PRELIMINARY SEtup (done in lab)

Do the following in your groups, then return to class to discuss to make sure you know how to use site:

1. Go to the following website:

https://phet.colorado.edu/en/simulation/capacitor-lab-basics

2. Open the capacitor only screen.

3. Play with the controls until you are familiar with how they work. Make sure you can use the voltmeter to measure the potential difference between the plates.

PROCEDURE

You will measure the capacitance for each capacitor using the following protocol. Note that the theoretical value is given to you at the top of the screen—-your fit of your data should agree with this value.

1. Set the distance and area to the required values.

2. Position voltmeter to measure potential difference.

3. Repeat the following until you have at least 7 points, starting at 0 and going up in steps of 0.2 V.

a) Set the battery voltage to required value.

b) record voltage and charge in first data table.

4. When complete, use Excel or LoggerPro to plot a graph between Q (Y axis) and V (X axis) and do linear curve fitting and determine slope. The slope is C (Cs). Remember to use SI units when plotting! Include all plots with fits in lab report.

5. You will repeat the above for three values of A and d. These values will be given to you by your professor. When you complete this task, fill out the second data table.

6. You will also calculate value of C (Cc) from equation 2.

7. Find percent error between three values of C as shown in the table 2.

DATA TABLEs

Add rows and columns as needed:

Data Table 1

Voltage (V)

Q1 (C)

Q2 (C)

Q3 (C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Same here:

Data Table 2

capacitor

A (mm2)

d (mm)

Theoretical Cth (pF)

Calculated Cc (pF)

Slope – Cs (pF)

Percent Error 1 for Cth and Cc

Percent Error 1 for Cth and Cs

1

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

ANALYSIS

1. You have already plotted the Q vs. V and determined the slopes. This is the first part of the analysis. Put these slopes in column 4 of data table 2.

2. For the second part of the analysis, use Eq. (2) and the data in columns 2 and 3 in data table 2 to calculate the capacitance for each capacitor geometry you measured. Put these values in column 5 of data table 2.

3. You will compare the results of C in columns 4 and 5, 4 and 6 in your lab report.

 

© 2021 Vernier, PHET and modified by Dr Dipti Sharma

 

 

 

image1.png

image2.png

Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteDemy. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.

Fill in all the assignment paper details that are required in the order form with the standard information being the page count, deadline, academic level and type of paper. It is advisable to have this information at hand so that you can quickly fill in the necessary information needed in the form for the essay writer to be immediately assigned to your writing project. Make payment for the custom essay order to enable us to assign a suitable writer to your order. Payments are made through Paypal on a secured billing page. Finally, sit back and relax.

Do you need an answer to this or any other questions?

About Wridemy

We are a professional paper writing website. If you have searched a question and bumped into our website just know you are in the right place to get help in your coursework. We offer HIGH QUALITY & PLAGIARISM FREE Papers.

How It Works

To make an Order you only need to click on “Order Now” and we will direct you to our Order Page. Fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.

Are there Discounts?

All new clients are eligible for 20% off in their first Order. Our payment method is safe and secure.

Hire a tutor today CLICK HERE to make your first order

Related Tags

Academic APA Writing College Course Discussion Management English Finance General Graduate History Information Justify Literature MLA