2017 AP Physics 1 Free Response #1
TLDRIn this educational video, Alan from Bothell STEM explores the 2017 AP Physics 1 free response question involving circuits with identical batteries and light bulbs. He explains the potential differences across the bulbs in three distinct circuit configurations, ranking them from highest to lowest. Alan then discusses which circuit will deplete the battery's energy first, analyzing the current and resistance in each setup. He concludes with a reminder to consult the scoring guidelines for a deeper understanding, encouraging viewers to engage with the content.
Takeaways
- 🔋 The video discusses the 2017 AP Physics 1 free response questions, particularly focusing on a circuit problem.
- 💡 Alan, the Bothell STEM coach, guides viewers through analyzing three different circuits with identical batteries and light bulbs.
- 🔌 Circuit one has a single light bulb connected to the battery, while circuits two and three have two light bulbs connected in different configurations.
- 📊 The task is to rank the potential difference across the light bulbs labeled A through E from largest to smallest.
- 🌟 Bulbs A, D, and E all see the full battery voltage, while B and C, being in series, see a lower voltage drop.
- ⚡ Bulb B has half the voltage of the battery due to the series connection, making it less than V but greater than C.
- 🔄 Bulbs A, D, and E are parallel and thus have the same potential difference, which is greater than that across B and C.
- 🔋 The video explains which circuit will deplete the battery's usable energy first based on the current and resistance in each circuit.
- 🚀 Circuit three, with the highest current (2V/R), will use up the energy first due to its lowest equivalent resistance.
- 🛑 Circuit two, with the highest equivalent resistance due to parallel resistors, will last the longest as it draws the least power.
- 📝 Alan emphasizes the importance of understanding the relationship between current, resistance, and power in determining energy usage.
- 👍 The video concludes with an invitation for viewers to engage by commenting, liking, or subscribing for more content.
Q & A
What is the topic of the video by Alan with Bothell Stem?
-The video is about analyzing the 2017 AP Physics 1 free response questions, specifically focusing on a circuit question.
What are the conditions of the batteries and light bulbs in the given circuits?
-The batteries in all three circuits are identical, and the light bulbs are also identical.
In circuit one, how is the light bulb connected to the battery?
-In circuit one, a single light bulb is directly connected to the battery.
What is the relationship between the potential difference across light bulbs A, D, and E in the circuits?
-Light bulbs A, D, and E all see the full battery voltage, indicating they have the same potential difference across them.
How does the potential difference across light bulbs B and C compare to A, D, and E?
-The potential difference across light bulbs B and C is less than that of A, D, and E because they are in series and each gets half the voltage of the battery.
What determines the order in which the batteries will run out of usable energy when connected to the light bulbs?
-The order is determined by the current coming out of the battery; the more current, the faster the battery will run out of energy.
Which circuit will cause the battery to run out of usable energy first and why?
-Circuit three will cause the battery to run out of energy first due to having the highest current, which is 2V/R.
Which circuit will have the battery lasting the longest and why?
-Circuit two will have the battery lasting the longest because it has the lowest current, which is V/2R.
What is the equivalent resistance in circuit three that leads to the highest current?
-In circuit three, the equivalent resistance is R/2 because two resistors are in parallel, leading to the highest current of 2V/R.
How does the arrangement of resistors in circuit two affect the current and power consumption?
-In circuit two, the resistors are in parallel, which increases the total cross-sectional area for current flow, thus reducing the equivalent resistance and increasing the current, but not as much as in circuit three.
What is the significance of the scoring guidelines mentioned in the video?
-The scoring guidelines are important as they provide a clear expectation of what is required for a correct answer and help in understanding how to structure the response to the AP Physics 1 free response questions.
Outlines
🔋 AP Physics Circuit Analysis
In this segment, Alan from Bothell STEMcoach introduces the 2017 AP Physics 1 free response questions, focusing on a circuit problem. He explains three different circuit configurations with identical batteries and light bulbs. In circuit one, a single bulb is connected to the battery. In circuits two and three, two bulbs are connected in series and parallel arrangements, respectively. Alan ranks the potential differences across the bulbs, identifying that A, D, and E see the full battery voltage, while B and C see half due to their series connection. He then discusses the rate at which the battery will deplete based on the current drawn by each circuit, concluding that circuit three, with the highest current, will run out of energy first, and circuit two, with the highest equivalent resistance, will last the longest.
📚 Reviewing Scoring Guidelines
Alan reviews the scoring guidelines for the first question, noting that the question was straightforward and that the EMM questions in AP Physics 1 are not overly difficult. He summarizes the expected responses, such as the ranking of potential differences (A, D > B = C) and provides a brief explanation of why certain bulbs have the same current and voltage. He encourages viewers to read through the guidelines for correct answers and to understand the reasoning behind the energy consumption rate of the circuits. Alan wraps up by inviting viewers to comment, like, or subscribe for more content on free response questions.
Mindmap
Keywords
💡AP Physics
💡Free Response Questions
💡Circuit
💡Potential Difference
💡Series Connection
💡Parallel Connection
💡Resistor
💡Current
💡Power
💡Equivalent Resistance
💡Scoring Guidelines
Highlights
Introduction to the 2017 AP Physics 1 free response questions.
Overview of the three circuits with identical batteries and light bulbs.
Explanation of the voltage across the light bulbs in different circuits.
Determination that light bulbs A, D, and E have equal potential difference.
Explanation that B and C have equal but lower potential difference.
Discussion on series and parallel connections in the circuits.
Clarification on why B and C have half the voltage drop compared to A, D, and E.
Analysis of which circuit's battery will run out of usable energy first.
Calculation showing circuit 3 has the highest current and will deplete the battery first.
Explanation of why circuit 2 will use energy the slowest due to its higher equivalent resistance.
Discussion on the relationship between resistance, current, and power in the circuits.
Explanation of the power dissipation in the circuits based on their current.
Mention of the scoring guidelines for the question.
Insight into the typical difficulty of circuit questions in AP Physics 1.
Conclusion and encouragement to like, comment, and subscribe.
Transcripts
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