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3 Pages

### E10_2-22-10

Course: PHYSICS 115, Spring 2010
School: Maryland
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Word Count: 341

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Ohms E10: Law Materials: Resistors, ammeter, voltmeter, power supply, wires, switch Initial definitions and givens: Resistance: the resistance of part of a circuit is defined to be the ratio of the voltage across it divided by the current flowing through it. R (ohms) = V (volts)/I (amperes) This is not Ohms law, it a definition A resistor is said to obey Ohms law if R doesnt change when V is changed. Resistor: a...

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Ohms E10: Law Materials: Resistors, ammeter, voltmeter, power supply, wires, switch Initial definitions and givens: Resistance: the resistance of part of a circuit is defined to be the ratio of the voltage across it divided by the current flowing through it. R (ohms) = V (volts)/I (amperes) This is not Ohms law, it a definition A resistor is said to obey Ohms law if R doesnt change when V is changed. Resistor: a circuit part with a well-defined resistance. Initial Instructions and questions: 1. Make a circuit with the power supply, ammeter, switch, and one of the resistors in series. Place the voltmeter in parallel with the resistor to measure the voltage between its two ends. Vary the output of the power supply so that the voltage across the resistor reads 1, 2, 3, 4, and 6 volts. Record the current through the resistor at each setting. Enter the data in GA and plot. (Careful: Should the voltage or current be the independent variable to be plotted on the x-axis?) 2. Take data similar for two other resistors. Figure out how to plot the data from all three resistors on one graph. Label each set of data. Do linear fits to each. 3. Do the resistors follow Ohms law? 4. Interpret the slopes and intercepts of your graphs. What is the resistance of each resistor? 5. Replace the resistor with a bulb. Take similar data, but go up to 10 volts, and make a separate plot. Does the bulb follow Ohms law? 6. If you have time, wire two resistors in series with a switch and ammeters. Vary the output of the power supply (1,2,3,4, and 6 volts) and measure the current in the circuit as well as the voltage across each resistor. You will have to move your voltmeter to separately measure the voltage across each resistor. Also measure the voltage across both resistors combined. Record those three voltages and the reading of the power supply. What can you say about the combined series resistance? As always, you should take lots of notes and draw all your circuits.
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Maryland - PHYSICS - 115
E11: More with Resistance and ResistorsMaterials:Power supply, multimeter, resistors, pencil, paper, play doh, wires, switchInitial definitions and givens:Multimeter: an electrical instrument that can measure voltage, current, and resistance. When a m
Maryland - PHYSICS - 115
E12: Equivalent resistance and powerMaterials:Power supply, multimeter, resistors, paper, wires, switchInitial definitions and givens:Equivalent resistor: a single resistor that can replace two or more resistors in a circuit with no change in the curr
Maryland - PHYSICS - 115
E13: Practical ElectricityA. Parallel and Series Circuits1. Christmas mini lightsi) Typically strings of 50, 100, or 150 bulbsii) Uses 2.5 V incandescent bulbsiii) 50 bulbs wired in series (why dont they all go out when one burnsout?)2. 3-way bulbs
Maryland - PHYSICS - 115
H1: Heat and temperature, what do they mean?Materials:thermometers, a metal plate, a wooden board, a piece of styrofoam, hot water,cold water (from ice slurry), room temperature water, styrofoam cupsInitial Instructions (Touch and Temperature):1. You
Maryland - PHYSICS - 115
H2: Thermal EquilibriumMaterials:computer with temperature probes, baggies, a large Styrofoam cup,hot water and tap waterInitial definitions and givens:Conservation of Energy: energy can not be created or destroyed. Itcan only change forms.Thermal
Maryland - PHYSICS - 115
H3: Mixing water at different temperaturesMaterials:hot water, cold, tap water, graduated cylinder for measuring the volume of water,scale for measuring the mass of water, temperature probesInitial Instructions and questions:Our goal today is to figu
Maryland - PHYSICS - 115
H4: Heat transfer, what does it mean?Materials:your data from H3, graph paper, hot water, cold water,Initial definitions and givens:calorie: amount of energy 1 gram of water gains or loses when it changestemperature by 1 degree. This physics calorie
Maryland - PHYSICS - 115
H5: Mixing un-like materialsMaterials:copper cylinder with hole, hot water, temperature probes, grabber for moving thecylinder, styrofoam cups, room temp waterInitial Instructions and questions:Get equal masses of copper and room temperature water. Y
Maryland - PHYSICS - 115
H6: Specific heat of aluminumMaterials:aluminum cylinder, hot water, temperature probes, grabber for moving the hotcylinder, styrofoam cups, room temp waterInitial Instructions and questions:Use your data from H5 to determine the specific heat of cop
Maryland - PHYSICS - 115
H7: Introduction to iceMaterials:ice cubes, hot water, Styrofoam cups, stop watchInitial Instructions and questions:Take one ice cube and try to keep it for as long as possible, at least until the endof class today.Take another ice cube and try to m
Maryland - PHYSICS - 115
H8: Mixing Ice and WaterMaterials:ice, hot water, room temperature water, styrofoam cups, temperature probesInitial Instructions and questions:1. Get a large cup of ice, add some room temperature water to create an iceslurry. Put both probes in the c
Maryland - PHYSICS - 115
H9: Melting ice latent heat of fusionMaterials:ice, hot water, styrofoam cups, scales, temperature probesInitial definitions and givens:latent = hidden or concealedfusion the act of melting by application of heat (one of several definitions)latent h
Maryland - PHYSICS - 115
H10: Condensing steam latent heat of vaporizationMaterials:hot plate with rod and flask clamp, Erlenmeyer flask with attached rubber hose,large Styrofoam cup, can to secure cup, scales, temperature probesInitial definitions and givens:latent heat of
Maryland - PHYSICS - 115
H11: Temperature of liquid nitrogenMaterials:liquid nitrogen, copper cylinder, large Styrofoam cup, grabbers for handling thecopper, warm water, temperature probesInitial Instructions and questions:Design an experiment to determine the boiling point
Maryland - PHYSICS - 115
H12: Rate of cooling, conservation of energy, Emmy NoetherMaterials:two small Styrofoam cups, each containing 200 mL of hot water, temperatureprobesInitial Instructions and questions:Design an experiment to test your ability to maintain the temperatu
Maryland - PHYSICS - 115
O1: Light emission from a bulbMaterials:Incandescent light bulbs, various light bulbs with unusual filament shapes, screenInitial definitions and givens:Incandescent: containing a filament that glows white-hot when a current is passedthrough it. (bas
Maryland - PHYSICS - 115
O2: Fun with shadowsMaterials:Incandescent light bulbs, screen, cardboard and scissorsInitial instructions and questions:1) Cut a shape out of thick paper. What do you predict the shadow will look like?Draw a sketch. How can you change the size of th
Maryland - PHYSICS - 115
O3: View through a pinhole cameraMaterials:Optical bench, metal cylinder, black paper, tape, pin, translucent screen, lightsourceInitial instructions and questions:1) Imagine light traveling through a tiny pinhole punched in a piece of blackpaper. D
Maryland - PHYSICS - 115
O4: Geometry of pinhole imagesMaterials:Optical bench, metal cylinder, black paper with a pinhole, translucent screen,projector to project a simple shapeInitial instructions and questions:1) Suppose you very gradually enlarged your pinhole, until eve
Maryland - PHYSICS - 115
O5: RefractionMaterials:Small rectangular fish tank, plastic ruler, big beaker, various sized metal rodsInitial instructions and questions:1) Fill your rectangular tank about 2/3 full of water.(a) Stick your ruler straight up and down, and view it th
Maryland - PHYSICS - 115
O6: Refraction: ray diagrams and Snells LawMaterials:Ray box, masking tape, semi-circular prism, rectangular prism, triangular prism,convex and concave lenses, polar graph paperInitial instructions and questions:1) Take a semi-circular prism, and for
Maryland - PHYSICS - 115
O7: An introduction to lensesMaterials:optical bench, concave lens, convex lens, graph paperInitial definitions and givens:focal point: the point at which incident parallel rays converge after passingthrough a positive lens or appear to diverge from
Maryland - PHYSICS - 115
O8: Lenses: ray diagramsMaterials:Ray box, optical bench, concave lens, convex lensInitial definitions and givens:real image: an image that can be projected on a screen. Light rays actuallyconverge there. Real images are always inverted.virtual imag
Maryland - PHYSICS - 115
O9: Ray tracing and imagesMaterials:Paper and rulerInitial definitions and givens:Converging (positive) lensDiverging (negative lens)
Maryland - PHYSICS - 115
O10: Eyes as an optical instrument and corrective lensesMaterials:Your eye, mirror, flashlight, optical bench, various concave and convex lensesInitial definitions and givens:CategoryNear PointFar PointNormal vision15 - 25 cmGreater than 2 mFars
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Axia College MaterialAppendix CClarifying Personal ValuesEach of you will be faced with numerous moral and ethical dilemmas throughout your career. Tobe prepared to make these ethical decisions, it is helpful to clarify your personal values, andmoral
Maryland - PHYSICS - 115
P hysics 115 S pring 2010 - L ist of ExperimentsD.C. HamiltonE1 Batteries and bulbsE2 What materials are conductors?E3 Batteries in seriesE4 Size and direction of currentE5 Bulbs in seriesE6 Parallel circuitsE7 More on parallel circuitsE8 Voltmet
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Checkpoint Week 1The purchase of a new house is a very big move but is a necessity when having a new baby.Currently we are living in an apartment so that we could save money, but it is not close to theschools or other things that we will need for the b
Maryland - PHYSICS - 115
Physics 115Spring 2010Calibrating the Temperature ProbesEquipment needed:1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.16.17.18.1. Cold water (ice water)2. Hot water3. Alcohol thermometer4. Temperature probesMake a copy of the Temp
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Checkpoint: Week 3Historical Example of Labor Supply and DemandIn 1929 the United States saw a enormous slump in the economy that has become known as theGreat Depression. Supply and demand was one of the causes in that it did not work as it issupposed
Maryland - PHYSICS - 270
Chapters 21 &amp; 22Interference and Wave OpticsWaves that are coherent can add/cancelPatterns of strong and weak intensitySingle Spherical SourceApproximate Electric Field:E (r, t ) = A(r ) cos( kr t + )Field depends on distance from sourceand time.
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Axia College MaterialAppendix CDifferentiating Between Market Structures Table and QuestionsFill in the matrix and describe differences in public and private goods, commonresources, and natural monopolies. Use your book and the Tomlinson video tutoria
Maryland - PHYSICS - 270
Incoherent vs Out of PhaseIncoherentTwo signals have differentfrequencies. Sometimes the samesign, sometimes opposite signs.Coherent, but out of phase.Two signals have the samefrequency, but one leads or lagsthe other.10.50.5Field1.51Field
University of Phoenix - XCOM - XCOM 285
Axia College MaterialAppendix CDifferentiating Between Market Structures Table and QuestionsFill in the matrix and describe differences in public and private goods, commonresources, and natural monopolies. Use your book and the Tomlinson video tutoria
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Week 5 CheckpointFiscal policy is used by the U.S. government to make sure that inflation is controlledduring economic recessions. The President and Congress share the responsibility of controllingfiscal policy management. Increases and decreases in ta
Maryland - PHYSICS - 270
Chapter 23Ray OpticsChapter 23. Ray OpticsTopics: The Ray Model of Light Reflection Refraction Image Formation by Refraction Color and Dispersion Thin Lenses: Ray Tracing Thin Lenses: Refraction Theory Image Formation with Spherical MirrorsWav
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Code of Ethics:All employees will conduct themselves morally and ethically as professionals in theworkplaceAll employees will abide by all rules and regulations that are enforced in the workplace.All employees respect other employees within the compan
Maryland - PHYSICS - 270
LensesThin Lenses: Ray TracingThin Lenses: Ray TracingThin Lenses: Ray TracingReal ImageThin lens approximationd &lt; D, fyD=2ad(y)We would like to show thatall rays, independent of thepoint they pass through thelens, y, focus to the samepoint
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Running head: CHECKPOINT: A NEW HOUSE ECONOMY1Checkpoint: A New House EconomyBrandon TateXECO-212October28,2011Alvin FuentesCHECKPOINT: A NEW HOUSE ECONOMY2Checkpoint: A New House EconomyThe purchase of a new house can be a life altering decisio
Maryland - PHYSICS - 270
Chapter 25. Modern Optics andMatter WavesThis image of the individualatoms in a silicon crystalwas made by exploiting thewave properties of electrons.Sometimes, electrons act lesslike particles and more liketraveling waves. This is animportant re
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International Trade Simulation 1......International Trade SimulationBrandon TateXECO-212November 06, 2011Angela Smith.International Trade Simulation 2Through international trade, every country worldwide can benefit by eitherimportation or e
Maryland - PHYSICS - 270
1. Moving charges (or equivalently electrical currents) create a magnetic field,!! 0 qv rB(r ) =,24 r!Here v is the velocity of the moving charge.This is the analog to the expression for the electric field due to a point charge.!E(r ) =qr4 0
University of Phoenix - XCOM - XCOM 285
Maryland - PHYSICS - 270
Chapter 34 ViewgraphsFaradays DiscoveryA current in a coil is induced if the magnetic field throughthe coil is changing in time.The current can be induced two different ways:1. By changing the size, orientation or location of the coilin a steady mag
Maryland - PHYSICS - 270
Chapter 35 ViewgraphsPreview of what is comingNew!Gives rise toElectromagneticwaves.Moving observers do not agree on thevalues of the Electric and magnetic fields.Observer S says:F = q E + v BObserver S says:How can both be right?(F = qE)q
Maryland - PHYSICS - 270
Chapter 36 ViewgraphsAC CircuitsIntroductionMost currents and voltages vary in time.The presence of circuit elements like capacitors and inductorscomplicates the relation between currents and voltage whenthese depend on time.Resistive element-I&amp;V
Maryland - PHYSICS - 270
Chapter 37. RelativityChapter1. Newtons laws and Maxwells equations describe the motionof charged particles and the propagation of electromagneticwaves under circumstances where the Quantum effects wediscussed last week can be ignored.2. There are s
Maryland - PHYSICS - 270
Chapter 38. The End ofStudies of the Classical Physicslight emittedby gas discharge tubeshelped bring classicalphysics to an end.Chapter Goal: Tounderstand how scientistsdiscovered the properties ofatoms and how thesediscoveries led to the need
Maryland - PHYSICS - 270
Chapter 39. QuantizationChapter 39. QuantizationTopics: The Photoelectric Effect Einsteins Explanation Photons Matter Waves and Energy Quantization Bohrs Model of Atomic Quantization The Bohr Hydrogen Atom The Hydrogen SpectrumThe Photoelectric
Maryland - PHYSICS - 270
Chapter 40Wavefunctions and UncertaintyChapter 40. Wave FunctionsChapterand UncertaintyTopics: Waves, Particles, and the Double-SlitExperiment Connecting the Wave and Photon Views The Wave Function Normalization Wave Packets The Heisenberg Unc
Maryland - PHYSICS - 270
Chapter 411D WavefunctionsChapter 41. One-DimensionalQuantum MechanicsTopics: Schrdingers Equation: The Law of Psi Solving the Schrdinger Equation A Particle in a Rigid Box: Energies and Wave Functions A Particle in a Rigid Box: Interpreting the S
Maryland - PHYSICS - 270
Exam 1 - ResultsEXAM 135Mean: 67StDv: 17Score3025Grade# Students20Count1584-100A231067 - 83B4450 - 66C33502033 - 49D130 - 32F530405060Score708090100
Maryland - PHYSICS - 270
Maryland - PHYSICS - 270
Exam 2 - ResultsExam230Mean: 53.7StDv: 1625ScoreGrade# Students70-100A2054 - 69B3538 - 53C4822 - 37D190 - 22F32015Count10500204060Score80100100806040Exam2Score200203040506070Exam1Score8090100
Maryland - PHYSICS - 270
Maryland - PHYSICS - 270
Exam 2 - ResultsExam 330Mean: 66StDv: 16252015Count10502030405060Score708090100100806040Exam2Score200203040506070Exam1Score8090100
Maryland - PHYSICS - 270
Maryland - PHYSICS - 270
Maryland - PHYSICS - 270