Following the Lab Report Grading Rubric and Based on our lab data writing the lab report conclusion - Science
CONCLUSION & RESULTS
Includes a summary of the results of the
experiment and the \% error involved.
Addresses the experimental objective and
EXPLAINS if it was accomplished or not
based on experimental results and \% error
involved.
Provides and explains one systematic error
involved in the experiment and explains how
it affected the outcome of the experiment and
the \% error involved.
Provides and explains one random error
involved in the experiment and explains how
it affected the outcome of the experiment and
the \% error involved. Resistance 1:Red/Yellow/Red/Red Color Code Table Expectation: 2400±2\%Resistance 2:Brown/Green/Red/Gold Color Code Table Expectation:1500±5\%i(Resistance 1)△V0.383*10^-30.80.891*10^-321.699*10^-33.92.591*10^-363.397*10^-384.278*10^-3105.111*10^-3125.933*10^-3146.800*10^-3167.620*10^-318Resistance 2:Brown/Green/Red/Gold Color Code Table Expectation:1500±5\%i(Resistance 2)△v0.637*10^-30.81.395*10^-322.757*10^-344.115*10^-35.95.498*10^-386.903*10^-3108.326*10^-3129.603*10^-31410.986*10^-31612.395*10^-318
lab_2___ohmic_resistors.pdf
lab_report_grading_rubric_2.pdf
labreportformat.pdf
lab_1___measuring_resistance.pdf
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TITLE – OHMIC RESISTORS
OBJECTIVES
1. To learn how to use the VOM, DMM, and HP-DMM to measure DC-Voltage and
DC-Current
2. Calculate the resistance of two resistors graphically using the characteristic curve
and compare with the expected value.
EQUIPMENT
1.
2.
3.
4.
5.
6.
7.
HP-DMM (used as an ammeter)
Hand-held DMM (used as a voltmeter)
VOM
Power Supply
≈100 Ω resistor, ≈ 600 Ω
5 leads, alligator clips, 2 power cords
2 dry-cell batteries
THEORY
1. i = current = dq/dt = time-rate of flow of charge through the cross-sectional area
of a conductor
2. R = Resistance = a measure of the opposition that a material (resistor) presents
to the flow of charge.
3. ΔV = potential difference (voltage, potential) = A measure of the change in
electric potential energy that a charge gains/loses as it moves between two
points in an E-field. Mathematically it is given by:
2
∆𝑉𝑉 = − � 𝐸𝐸�⃗ ∙ 𝑑𝑑𝑠𝑠⃗ =
1
∆𝑈𝑈
𝑞𝑞
4. The SI unit of potential difference is the Volt )V: 1V = 1 J/1C
One Volt is equivalent to one Joule per Coulomb. If the electric potential difference between
two locations is 1 volt, then one Coulomb of charge will gain 1 joule of potential energy when
moved between those two locations.
5. Ohm’s Law relates V, i, and R. It is given by:
∆𝑉𝑉 = 𝑖𝑖𝑖𝑖
Ohm’s Law
PROCEDURE
1. Measure the DC-Voltage of two difference dry-cell batteries and compare with
the expected measured value.
2. Setup the following circuit:
3. Adjust ΔVout to collect 10 data points for ΔV and i.
4. Make a graph on EXCEL of i vs. ΔV and obtain the equation of the best curve-fit.
Make sure graph is labeled properly!
5. Calculate resistance of resistor from equation of best-curve fit and compare
with expected measured value.
LAB REPORT GRADING RUBRIC
TITLE:
b Section
Description of Section
Possible
Points
1
PARNERS
NAMES
1. Partners names at the upper right-hand
corner of the first page of the lab report.
1. Includes handout containing these
components stapled to lab report or each
component is explicitly written.
THEORY
1. The theory/principle/law associated with the
lab is clearly stated.
2. Explained how the theory will be used to
accomplish the objective of the lab.
3. Derivation/proof of equations are done
clearly and logically.
1. All data is labeled, organized, and easy to
read.
2. Used table-format whenever appropriate
3. Data measurements taken correctly.
4. Used appropriate significant figures and
units.
5. Graphs have correct axis labeled, units, and
scale.
2
CALCULATIONS
1. Calculations are labeled with equations
shown.
2. Calculations are clear and legible.
3. Calculations are done correctly
4. Calculations have correct number of
significant figures and units.
5. \% error calculation shown.
5
CONCLUSION
1. Includes a summary of the results of the
experiment and the \% error involved.
2. Addresses the experimental objective and
EXPLAINS if it was accomplished or not
based on experimental results and \% error
involved.
3. Provides and explains one systematic error
involved in the experiment and explains how
it affected the outcome of the experiment and
the \% error involved.
4. Provides and explains one random error
involved in the experiment and explains how
it affected the outcome of the experiment and
the \% error involved.
5
TITLE
OBJECTIVE
THEORY
EQUIPMENT
PROCEDURE
DATA
Write the
conclusion in
outline-number
form to obtain
credit!
SCORE
2
5
20
Your
Score
Lab Report Format
Physics 2A, 4A-D
1. TITLE
Place the title of the lab experiment at the top of the first page.
2. OBJECTIVE
State the objective of the experiment clearly. The objective of the experiment is what you’re trying to prove or
accomplish.
3. THEORY
Explain relevant concepts and provide any appropriate definitions. Pertinent equations should be derived in a
clear, logical manner. Any relevant background information may also be included in this section.
4. APPARATUS
Record a list of the equipment being used. Write down the serial number, model, and make of the equipment.
You will need this information for reference in case you need to repeat the experiment or collect additional
data. Describe the equipment being used and draw a diagram or picture of the equipment.
5. PROCEDURE
This section includes your plan for performing the experiment. The experimental plan should be written in a
step-by-step, orderly fashioned method. It describes in detail your procedure for performing the lab such that
you or anyone else could re-create the experiment exactly as it was performed. The experiments in the lab
manual/handouts already have a step-by-step written procedure. You may cut and paste the written procedure
from your lab manual into your lab notebook. Keep in mind that you may need to repeat an experimental
procedure during the lab final. (The lab handouts have the TITLE, OBJECTIVE, THEORY, APPARATUS,
and PROCEDURE sections already written out, so you may cut and paste these sections into your lab
notebook.)
6. DATA
Your data should be well organized and easy to read. Label each set of data with the appropriate quantity
being measured along with the trial/run number. Use ‘table’ format for easier reading. Your data should have
the correct number of significant figures and appropriate units. If your data is represented by graphical
methods, make sure your graph has been appropriately labeled with the correct axis, units, and scale. Any
work that is printed out from the computer must be attached securely (taped, glued, stapled ....)to your lab
notebook. DO NOT FOLD PRINTOUTS AND SLIP INTO NOTEBOOK! Any work that is done on the
computer should not be saved on the hard drive! Once finished with your work, delete it and empty Recycle
Bin.
7. CALCULATIONS
Write down equations being used to do calculations. The calculations should be clear and readable. Show and
label calculations in complete detail for any quantity. If you are repeating a calculation several times, you only
need to show one sample calculation. The calculation for \% error between experiment and theory should be
included here.
8. CONCLUSION & RESULTS
Include a discussion of the results and their significance. Address the experimental objective and state
whether it was accomplished. Comment on the \% error between theory and experiment. Identify at
least two sources of experimental error (systematic or random) to account for the percentage error
involved in the experiment. Explain how these errors effected the outcome of the experiment? Was
the experimental result greater than or less than the theoretical value? Was this what you had
anticipated? Explain why or why not? You may also discuss methods to eliminate or minimize these
experimental errors.
TITLE - MEASURING RESISTANCE
OBJECTIVES:
1. To understand the quantity of resistance for a material.
2. Learn how to use a VOM, DMM, and HP-DMM to the resistance of a resistor.
3. Learn how to use a color-code table to determine resistance of a resistor.
THEORY:
1. i = current = time-rate of flow of charges through the cross-sectional area of a conductor
i = dq/dt
2. The SI unit of the current is the ampere (A): 1A = 1C/s
3. Resistance = a measure of the opposition that a material (resistor) presents to the flow of
charge.
4. Materials that have a large resistance are called resistors. They are used to limit the flow of
current along a circuit. Common resistors are made of carbon and nichrome.
5. Materials with very small resistance are called conductors and materials with very large
resistance are called insulators.
6. The SI units of resistance is the ohm (Ω).
Using a Resistance Color Code Table
EQUIPMENT
1. VOM, DMM, HP-DMM
2. 3 different resistors
3. 2 leads, 2 alligator clips
PROCEDURE
1. Determine the resistance of all 3 resistors using the color-code table.
2. Measure the resistance of all 3 resistors using the VOM, DMM, and HP-DMM. Refer to
Appendix II in Physics 4B lab classic Manual.
3. Compare measured resistance values to color-code table values (calculate \% error) and also
determine if they are within tolerance.
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