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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Light Bulb Resistance

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Which type of bulb – Type A or Type B – offers the greatest resistance to the flow of charge?

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How does the diameter of a bulb filament relate to the amount of resistance and the flow rate?

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Summarize and synthesize the findings from all five experiments.

Experiments 4 and 5

Does the location of a bulb determine its resistance and whether or not it or other bulbs will light?

Experiments 1 and 2

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Summing It Up

Experiments 1 Through 3

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Light Bulb Resistance Two students are investigating the resistance of light bulbs. Their materials include two different types of light bulbs - a Type A and a Type B bulb. Experiment 1 In Experiment 1, the students use two D-cells and two Type A light bulbs to construct the electric circuit shown in Figure 1. When they make the final connection to the battery, they observe that the bulbs both Location 1 and Location 2 are lit. Experiment 2 In Experiment 2, the students use two D-cells and two types of light bulbs – Type A and Type B. They construct the circuit in Figure 2. They observe that the Location 1 bulb is lit and Location 2 bulb appears to not be lit. Bulb Location 1 is a Type B bulb and Bulb Location 2 is a Type A bulb. Experiment 3 In Experiment 3, the students use the same circuit used in Experiment 2 except that they switch the positions of the two light bulbs. Bulb 1 Location has a Type A bulb and Bulb 2 Location has a Type B bulb. Bulb 2 appears lit and bulb 1 appears to not be lit. Experiment 4 In Experiment 4, the students use a microscope to compare the diameter of the filaments and the support posts of the two types of bulbs. See Figure 3. They observe that the support posts of both types of bulbs have equal diameters. They observe that the filaments are significantly narrower than the support posts. And they observe that Type A bulbs consist of a larger diameter wire than Type B bulbs. Experiment 5 In Experiment 5, the students model the flow of charge through wires by the flow of air through straws of varying diameter. They take a deep breath and exhale the air in their lungs through a coffee stirrer, a drinking straw and a milkshake straw. The straw diameters and the times to exhale a full breath of air are listed in Table 1.

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https://www.physicsclassroom.com/

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Physics-Interactives/Static-Electricity/

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1,1,2,2,2,1,1,4,1,2,1,1,1,1,2,3,1,1

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Experiments 1 and 2,Experiments 1 through 3,Experiments 4 and 5,Summing It Up

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