1202_LabManual.pdf

# How does the brightness of bulb a circuit i compare

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How does the brightness of bulb A (Circuit I) compare to the brightness of bulbs D and E (Circuit III)? What can you infer about the current at point 1 in each of the two circuits? Circuit IV Connect Circuit IV. Compare the brightness of bulbs F and G with that of H. What can you conclude from this observation about the amount of current through each bulb? 43

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QUALITATIVE CIRCUIT ANALYSIS – 1202Lab2Prob2 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 branches? How does the current at point 1 compare with the currents at points 2 and 3? How does the brightness of bulb B and C compare to the brightness of bulbs G and H? What can you infer about the current at point 1 in each of the two circuits? Comparing the four circuits, does the amount of current at point 1 appear to remain constant or to depend on the number of bulbs and how they are connected? C ONCLUSION Rank the actual brightness of the bulbs. How did this compare to your prediction? Make sure you adequately describe what you mean in your comparisons, i.e. “the same brightness as”, “brighter than”, “dimmer than”. What type of circuit is used in your track lighting? Circuit II is called a series circuit and Circuit III is called a parallel circuit . Can you use conservation of energy and conservation of current to explain your results? The rate that energy is output from a bulb is equal to the potential difference (voltage) across the bulb times the current through the bulb. Does a battery supply a constant current or a constant potential difference to circuits? To check your understanding, rank the brightness of the bulbs in the following circuits. Use the lab equipment to see if your answer is correct. 44