O2>1>3 01=2>3 L The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. Rank the brightness of the lightbulbs, greatest to least, before and after the switch S is closed. Before the switch is closed, they rank greatest to least brightness. After the switch is closed, they rank greatest to least brightness. 0 1 2 3 O2>1>3 1=2>3 7 1 7 1 " 1>2=3 1>2=3 1>2=3 2=3> 1 S 1=2=3 3 2
O2>1>3 01=2>3 L The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. Rank the brightness of the lightbulbs, greatest to least, before and after the switch S is closed. Before the switch is closed, they rank greatest to least brightness. After the switch is closed, they rank greatest to least brightness. 0 1 2 3 O2>1>3 1=2>3 7 1 7 1 " 1>2=3 1>2=3 1>2=3 2=3> 1 S 1=2=3 3 2
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Transcribed Image Text:The diagram features three identical lightbulbs labeled 1, 2, and 3 connected to a battery. A switch, labeled S, can open or close the circuit. The text prompts to rank the brightness of these lightbulbs before and after the switch is closed.
**Description of the Diagram:**
- **Lightbulb 1 and 2**: Connected in series with the battery.
- **Lightbulb 3**: Initially disconnected, becomes parallel with lightbulb 1 when switch S is closed.
**Instructions:**
Fill in the blanks by selecting the correct ranking of the bulbs from greatest to least brightness, both before and after closing the switch S.
**Options:**
1. **Before**: 2 > 1 > 3 , **After**: 1 > 2 = 3
2. **Before**: 1 = 2 > 3 , **After**: 1 > 2 = 3
3. **Before**: 1 > 2 > 3 , **After**: 1 > 2 = 3
4. **Before**: 2 > 1 > 3 , **After**: 2 = 3 > 1
5. **Before**: 1 = 2 > 3 , **After**: 1 = 2 = 3
**Educational Objective:**
This exercise teaches about circuit behavior, particularly how bulb brightness is affected by changes in circuit configuration. Understand the flow of electric current and its impact on series and parallel circuits.
Expert Solution
Step 1
Here bulbs 2 and 3 are in parallel connection and bulb 1 is connected to the battery as a series. When the switch is not closed the current and voltage only passes through bulbs 1 and 2 there's no possibility that the voltage will move to bulb 3. So, bulbs 1 and 2 are in series Here the current flow through the series the voltage consumed by the bulbs is split in half. Bulbs 1 and 2 are having same power factor then the brightness is same but the 3rd bulb doesn't have brightness at all
Therefore, the brightness level of the bulbs are 1 = 2 > 3.
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