Rank the brightness of the bulbs a b c d h j k l m

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Unformatted text preview: bead separating the filament wires is the same. If equipment is missing or broken, submit a problem report by sending an email to [email protected] Include the room number and brief description of the problem. 85 MORE COMPLEX CIRCUITS – 1302Lab4Prob2 PREDICTION Restate the problem. Rank the brightness of the bulbs A, B, C, D, H, J, K, L, M, and N from the brightest to the dimmest (use the symbol „=‟ for "same brightness as" and the symbol „>‟ for "brighter than"). Write down your reasoning. EXPLORATION Reference Circuit I. Connect Circuit I to use as a reference. Note: Pay attention to large differences you may observe, rather than minor differences that may occur if two "identical" bulbs are, in fact, not identical. How can you test whether minor differences are due to manufacturing irregularities? Circuit II Connect Circuit II. Compare the brightness of bulbs B and C. Compare the brightness of bulbs B and C to bulb D. What can you conclude from this observation about the amount of current through each bulb? How does the brightness of bulbs B and C compare to the brightness of bulb A (Circuit I)? What can you infer about the current at point 2 in Circuit II and the current at point 1 in Circuit I? How does the brightness of bulb D compare to the brightness of bulb A (Circuit I)? What can you infer about the current at point 3 in Circuit II and the current at point 1 in Circuit I? Describe the flow of current around the entire circuit. What do your observations suggest about the way the current through the battery divides and recombines at junctions where the circuit splits into two parallel branches? How does the current at point 1 in Circuit II compare with the current at point 1 in Circuit I? Explain any differences. Circuit III. Connect Circuit III. Compare the brightness of the bulbs. What can you conclude from this observation about the amount of current through each bulb? 86 MORE COMPLEX CIRCUITS – 1302Lab4Prob2 How does the brightness of bulb H compare to the brightness of bulb A (Circuit I)? What can you infer about the current at point 1 in Circuit III and the current at point 1 in Circuit I? Circuit IV. Connect Circuit IV. Compare the brightness of the bulbs. What can you conclude from this observation about the amount of current through each bulb? How does the brightness of bulb L compare to the brightness of bulb A (Circuit I)? What can you infer about the current at point 1 in Circuit IV and the current at point 1 in Circuit I? CONCLUSION Rank the actual brightness of the bulbs A, B, C, D, H, J, K, L, M and N. Make sure you have adequately defined your comparisons: “same brightness as”, “brighter than”, and “dimmer than”. How did your prediction compare to your results? Can you use conservation of energy and conservation of current to explain your results? How will you connect your three strings of lights so that they are all as bright as possible? 87 MORE COMPLEX CIRCUITS – 1302Lab4Prob2 88 PROBLEM #3: SHORT CIRCUITS A friend of yours who manages a movie theater is having a problem with the lights that surround the marquee. Some of the light bulbs don’t light up. But when he takes out the bulbs and checks them individually, they all work. You tell him he must have a short circuit. You explain that you have a short circuit when a wire makes an alternate path for the current to bypass a circuit element. To demonstrate this idea, you build a few simple circuits to show the results of a short circuit. Instructions: Before lab, read the laboratory in its entirety as well as the required reading in the textbook. In your lab notebook, respond to the warm up questions and derive a specific prediction for the outcome of the lab. During lab, compare your warm up responses and prediction in your group. Then, work through the exploration, measurement, analysis, and conclusion sections in sequence, keeping a record of your findings in your lab notebook. It is often useful to use Excel to perform data analysis, rather than doing it by hand. EQUIPMENT You will build three simple circuits shown below out of wires, bulbs, and batteries. Legend: light bulb battery Use the accompanying legend to build the circuits. wire Note: Make sure that you are using identical light bulbs. Look for markings on the base of the bulb and check to see that the color of the bead separating the filament wires is the same. If equipment is missing or broken, submit a problem report by sending an email to [email protected] Include the room number and brief description of the problem. 89 SHORT CIRCUITS – 1302Lab4Prob3 PREDICTION Restate the problem. Circuit II: What happens to the brightness of bulbs B and C when a wire is attached across bulb B (from point 1 to point 2)? Circuit III: What happens to the brightness of bulbs D and E when a wire is attached across bulb E? Circuit I: What happens to the brightness of the bulb A when a wire is attached across the bulb? EXP...
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This document was uploaded on 02/23/2014 for the course MANAGMENT 2201 at University of Michigan.

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