In the circuit shown, how do the brightnesses of the identical bulbs compare? Which lightbulb draws the most current? What happens if bulb A is unscrewed? If bulb C is unscrewed?
The comparison between the brightness of the bulbs, light bulb that draws more current and the consequence when the bulbs are unscrewed.
Explanation of Solution
Introduction:
The brightness of the bulb depends on the supply. The current depends on the resistance.
In the given circuit, bulb C is connected in parallel across the battery. So, the bulb C will be brighter as it draws more current. Bulb A and bulb B are connected in a series and the combination of these is connected in a parallel across the battery. So, the voltage across bulb A and bulb B will be less than bulb C. Bulb A and bulb will have the same brightness.
If bulb A is unscrewed, then the current only passes through bulb C. There will be no effect on the brightness of bulb C.
If the bulb C is unscrewed, then the current will pass through bulb A and bulb B. Bulb A and bulb B will be lit with the same brightness.
Conclusion:
The brightness of each bulb is the same. Bulb C draws more current, the current only passes through bulb C if bulb A is unscrewed and the current passes through bulb A and bulb B if bulb C is unscrewed.
Chapter 35 Solutions
Conceptual Physics: The High School Physics Program
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