Do you know why we should connect them in these ways

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Unformatted text preview: ith other groups to compare the brightness of bulb A in each of the three circuits. If necessary, use a DMM to measure the current through bulb A in each of the three circuits. When using the DMM, pay special attention to the connections and settings that are used to measure voltages and currents and why the DMM should be connected in the circuit differently for voltage and current measurements. Do you know why we should connect them in these ways? CONCLUSION Qualitative circuit analysis is very useful for quickly checking the results of the algebra that come from quantitative circuit analysis. It is a great way to catch mistakes before you fry expensive circuits. Explain any differences between your predictions and your observations. Each qualitative rule is the result of applying conservation of energy (Kirchhoff's loop rule), conservation of charge (Kirchhoff's junction rule), and Ohm’s law to different circuit configurations. . To summarize the material learned, for each qualitative rule, write the corresponding equation(s). 123 QUALITATIVE CIRCUIT ANALYSIS – 1302Lab4Prob11 124 CHECK YOUR UN D ERSTAN D IN G LAB 4: CIRCUITS 1a. What w ou ld hap p en to the brightness of bu lb A in the circu it below if m ore bu lbs w ere ad d ed p arallel to bu lbs B and C? 1b . In hou sehold circu its, a fu se or circu it breaker is in the p osition occu p ied by bu lb A, w hy? 2. In circu its I throu gh IV below , the fou r batteries su p p ly the sam e voltage and all bu lbs are id entical. Rank the circu its from the largest cu rrent at p oint 1 to the sm allest cu rrent at p oint 1. Exp lain you r reasoning. 3. P red ict w hat w ill hap p en to th e b rightness of bu lbs A, B, C and D if bu lb E w ere rem oved from its socket. Exp lain you r r easoning. 125 CHECK YOUR UN D ERSTAN D IN G LAB 4: CIRCUITS 4. For the circu it below , d eterm ine the cu rrent in each resistor. 8 12 + - 24 V 6 24 + - 12 V 36 5. For the circu it below , d eterm ine the valu e for R su ch that the cu rrent I3 is 0.1A w ith the ind icated d irection. 5 20 + - 3V R + 6V I3 W hat is the valu e for R that w ill give a cu rrent I 3 = 0.1 A, bu t in the op p osite d irection to w hat is show n? 126 TA Name: PHYSICS 1302 LABORATORY REPORT LAB 4: Name and ID#: Date performed: Day/Time section meets: Lab Partners' Names: Problem # and Title: Lab Instructor's Initials: Grading Checklist Points LABORATORY JOURNAL: PREDICTIONS (individual predictions and warm-up completed in journal before each lab session) LAB PROCEDURE (measurement plan recorded in journal, tables and graphs made in journal as data is collected, observations written in journal) PROBLEM REPORT:* ORGANIZATION (clear and readable; logical progression from problem statement through conclusions; pictures provided where necessary; correct grammar and spelling; section headings provided; physics stated correctly) DATA AND DATA TABLES (clear and readable; units and assigned uncertainties clearly stated) RESULTS (results clearly indicated; correct, logical, and well-organized calculations with uncertainties indicated; scales, labels and uncertainties on graphs; physics stated correctly) CONCLUSIONS (comparison to prediction & theory discussed with physics stated correctly ; possible sources of uncertainties identified; attention called to experimental problems) TOTAL(incorrect or missing statement of physics will result in a maximum of 60% of the total points achieved; incorrect grammar or spelling will result in a maximum of 70% of the total points achieved) BONUS POINTS FOR TEAMWORK (as specified by course policy) * An "R" in the points column means to rewrite that section only and return it to your lab instructor within two days of the return of the report to you. 127 128 LAB 5: MAGNETIC FIELDS AND FORCES Magnetism plays a large part in our modern world's technology. Magnets are used today to image parts of the body, to explore the mysteries of the human brain, and to store analog and digital data. Magnetism also allows us to explore the structure of the Universe, the atomic structure of materials, and the quark structure of elementary particles. In this set of laboratory problems, you will map magnetic fields from different sources and use the magnetic force to deflect electrons. The magnetic interaction can best be described using the concept of a field. For this reason, your experiences exploring the electric field concept in the first lab are also applicable in this lab. There are similar activities in both labs so you can experience the universality of the field concept. Although they are related, the magnetic force is not the same as the electric force. You should watch for the differences as you go through the problems in this lab. OBJECTIVES: After successfully completing this laboratory, you should be able to: • Explain the differences and similarities between magnetic fields and electric fields. • Describe magnetic fields near sources, such as permanent “bar” magnets, strai...
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