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s05_concept - Light Bulb II Concept Test A 24 V B S 12 V C...

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Light Bulb II Concept Test S C A B 24 V 12 V The light bulbs in the circuit are identical. When the switch is closed, 1. The intensities of light bulbs B and C increase. 2. The intensities of light bulbs B and C decrease. 3. The intensity of light bulb A increases. 4. The intensity of light bulb A decreases. 5. A combination of 1 and 4 6. A combination of 2 and 3 7. Nothing happens 8. None of the above
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Light Bulb II Solution 0 5 10 15 20 25 30 35 40 1 2 3 4 5 6 7 8 Number of Students Answer Lecture S5: Light Bulb II 0 10 20 30 40 50 1 2 3 4 5 6 7 8 Number of Students Answer Lecture S5: Light Bulb II Before the switch is closed, the current through the three bulbs must be the same. Thus, the voltage drop across each bulb is the same. Because the total voltage drop across the three bulbs is 24 V, the drop across each bulb must be 8 V. Therefore, if we designate the lower node as ground, the
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potential of the node to the left of the switch is 16 V. After the switch is closed, the potential of the node to the left of the switch must be 12 V, since the upper terminal of the battery is 12 V above ground potential.
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