PH112L - Physics II Lab

Winter Term 2013

General Information

Instructor:    Galen C. Duree Jr., PhD

Office:    Room DL102                       Phone:    872-6025                                 Box:    182


Office Hours:      9:00 AM - 10:30 AM   M Th  &  4:20 PM - 5:30 PM M T  Th F

The final experiments for the Physics II laboratories titled "DC Circuits:  Ohm's Law and Kirchhoff's Laws", a description of which can be found in the lab manual beginning on page 4-10, will be conducted in BL114 this week.  The lab reports are due in the green bin outside my office by 5:30 PM one week after you perform the experiments.

Section 55 lab will meet on Tuesday, February 11, 2014

Section 64 lab will meet on Friday, February 14, 2014


As I am sure that you are surprised, please follow the lab manual for this lab report.  The Analysis that you need to perform is imbedded in the procedure described in the lab manual.  Just make sure that you evaluate Ohm's Law, series and parallel resistor models, and Kirchhoff's Loop Rule (this means that the Superposition measurements as well as Step 9 in the lab manual are NOT required, but will be extra effort if you do them correctly).  This means that you need to propagate the uncertainty in your calculations and make a conclusion about how the experimental and theoretical values overlap.  Please make sure that you measure all of the resistors on the board with the ohmmeter before you leave lab (also make sure that the resistors are not in a circuit when you measure them)!  Make a statement in the conclusion about the appropriateness (or lack thereof) of the models for your situation.

Download a copy of the Error Analysis Worksheet.

After this lab, you are done for the term!  Please fill out the course evaluation and good luck on all of your finals!


Lab Report Format

A complete lab report must have the following sections:

Do not forget to update your Table of Contents and to number the pages in your lab notebook!

The first page of your report must have a title, the name of the P.I. (explicitly indicate who was the P.I.), the name of the lab assistant, and the date that the report was turned in (not the date that you performed the experiment!).

*Abstract - a BRIEF description of what you were investigating, how you conducted the experiment and your conclusions based on your experience.  The abstract should not be a discussion of what you are going to do in the lab.  The abstract cannot be written before you have analyzed your data.  In the lab notebook, skip a page or two so that you can write this in at the beginning of the report after you have analyzed your data.

Introduction - a discussion about any details that you think would help someone perform the experiment.  This should include a discussion about the model or the method selected for performing the tests.  If you use models (equations) in your analysis, list the models in this section and describe what each of the variables represent.  Do NOT include formulas for calculating averages and standard deviations.

**Procedure - a detailed description of what you did in the lab.  At the beginning of this section, place the date and the time that you began the experiment.  This section must include a schematic, detailing how things were connected, where appropriate.  The raw data must appear in this section immediately following the description about how the data was taken.   A person must be able to read your procedure section and be able to duplicate your results without having the lab manual present.  Do not do any calculations in this section, just record how you performed the experiments and record the raw data.  If the data is taken by computer, you must specify the path and filename where the data is stored.   This information must be listed in this section right after the description of how the data was taken.  Do not simply list all of the files generated at the end of the section.

This section MUST be signed by the instructor before you leave the lab.  If you turn in a report without the signature, it will not be accepted!

Analysis - a sample of the calculations made in the lab.  This section should include a sample of the error calculations and propagation of errors used in your analysis.   The final data that you are analyzing to generate conclusions, the values with appropriate uncertainties, must be shown in this section.  The actual calculations for each one does not have to be included, as long as you show an example for one, but you may include them all if you wish.  The calculations may be done by the computer, but include printouts of the worksheet in your lab book.  Any graphs or printouts that are placed in your notebook must occupy one whole page and be trimmed to fit within the page and not hang outside of the notebook.

*Conclusion - this section must have a conclusion that is based on your experiments and analysis.  If your conclusions do not following logically from your analysis, your grade will be deducted significantly.  This section must also contain a brief description of significant factors that you think affected your data, in particular, the uncertainties in your data (factors that contributed to the error in your experiment).  A good thing to keep in mind is to think of this report as a report you are submitting as part of your job responsibilities.   If you do not think your boss would accept what you have to say, it is a safe bet that I will not like it either.

The asterisks indicate the sections that I will pay closest attention to.

Modified February 10, 2014 by Galen C. Duree Jr.