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Question in AP Format
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by Greg Jacobs
Woodberry Forest School
Woodberry, Virginia
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| | Consider three commercially available, standard incandescent lightbulbs, each rated for use on a standard 120 V wall outlet. Bulbs A and C are rated at 100 W; bulb B is rated at 60 W. (For the questions below, ignore any effects of temperature on resistance.)
a. Determine the resistance of each of the three bulbs.
b. Consider that bulbs A and B are connected in series with each other and with a 120 V wall outlet.
i. Fill in the chart below for each bulb in the series circuit.
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Voltage |
Current |
Resistance |
Power |
| Bulb A |
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| Bulb B |
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ii. Indicate which bulb is brighter. Justify your answer.
c. If, separately, bulb C is connected directly to a 50 V source, how will its brightness compare with that of bulbs A and B in part (b) of this question? Explain.
d. Now bulbs A and B are connected in parallel with each other and with a 120 V wall outlet. Determine the total power dissipated by this circuit.
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