2015 AP Physics 1 Free Response #2
TLDRIn this educational video, Alan from Bothell STEM continues to explore AP Physics with the 2015 free response questions. He discusses an experiment to determine what happens in an incandescent light bulb when in series with a resistor. Alan explains how to set up the equipment, including ammeters and voltmeters, to measure current and voltage changes. He also addresses the concept of non-ohmic behavior in light bulbs and suggests plotting current versus voltage to analyze the data for linearity. The video concludes with a mention of Alan's free homework help on Twitch and Discord.
Takeaways
- 📚 Alan is coaching AP Physics students through the 2015 free response questions.
- 💡 The video focuses on questions related to incandescent light bulbs and their behavior when in series with a resistor.
- 🔋 Students are equipped with an adjustable power source, insulated wire, light bulbs, resistors, switches, voltmeters, and ammeters for the experiment.
- 🔍 Alan suggests setting up ammeters in series to measure the current entering and leaving the bulb to address the first question about electron flow.
- 🌡 For the second question about the electric potential change inside the bulb, Alan recommends using voltmeters to measure voltage across different points.
- ⚡ It's clarified that all electrons flow through and no electrons are stored within the light bulb.
- 🔧 Alan explains that the light bulb's resistance may change with current, indicating it could be non-ohmic, and suggests adjusting the power source to test this.
- 📈 To determine if the bulb is non-ohmic, Alan advises plotting I1 versus V and analyzing the linearity of the relationship.
- 📊 The accuracy of the experiment is limited by the precision of the voltmeters and ammeters, and Alan mentions the importance of considering uncertainties.
- 👨🏫 Alan offers free homework help on Twitch or Discord for students with questions in math and physics.
- 👋 The video concludes with an invitation for viewers to join Alan on his platforms for further learning and interaction.
Q & A
What is the main topic of the video?
-The main topic of the video is to continue discussing the AP Physics 1 2015 free response questions, specifically focusing on an experiment related to incandescent light bulbs and their behavior in a circuit with a resistor.
What are the two key questions the video aims to address?
-The two key questions are: 1) What gets used up in an incandescent light bulb when it is in series with a resistor, and 2) Does the electric potential of the electrons change while inside the bulb.
What equipment does the video mention for the experiment?
-The equipment mentioned includes an adjustable power source, insulated wire, light bulbs, resistors, switches, voltmeters, and ammeters, along with standard lab equipment.
How does the video suggest setting up the ammeters for the first part of the experiment?
-The video suggests setting up the ammeters in series with the light bulb to measure the current going in and out of the bulb.
What is the purpose of measuring the current with ammeters in the first part of the experiment?
-The purpose is to determine if there is a difference in the current entering and leaving the light bulb, which would indicate whether electrons are being stored inside the bulb.
How does the video propose to measure the electric potential change inside the bulb?
-The video proposes using voltmeters to measure the voltage across different points of the bulb to determine if there is a voltage drop across it, indicating an energy change.
What adjustments are suggested for the setup to determine if the light bulb is non-ohmic?
-The video suggests adjusting the power source to vary the current and recording the voltage and current at different power values to see if there is a linear relationship between them.
How can the data from the experiment be analyzed to determine if the bulb is non-ohmic?
-The data can be analyzed by plotting a graph of current (I) versus voltage (V) to see if the relationship is linear, which would indicate whether the bulb follows Ohm's law.
What is the significance of the term 'non-ohmic' in the context of the experiment?
-A non-ohmic device is one where the resistance is not constant and changes with the current, which means the relationship between voltage and current is not linear.
How does the video address the potential inaccuracies in the measurements?
-The video acknowledges that the accuracy of the measurements is limited by the precision of the voltmeters and ammeters and suggests taking multiple readings to account for this.
What additional resources does the video mention for homework help?
-The video mentions that free homework help is offered on Twitch or Discord for those who have questions or want to learn about different parts of math and science.
Outlines
🔬 AP Physics Experiment: Incandescent Light Bulb and Resistor Series
In this segment, Alan from Bothell STEM coach explores AP Physics 1's 2015 free response question 2. The focus is on understanding what occurs in an incandescent light bulb when it's in series with a resistor. Alan suggests an experimental setup to determine if electrons are stored within the bulb or if there's a change in electric potential as electrons pass through. The equipment includes an adjustable power source, insulated wire, light bulbs, resistors, switches, voltmeters, and ammeters. The experiment involves setting up ammeters to measure the current entering and exiting the bulb to check for electron storage and using voltmeters to measure any potential change across the bulb. Alan emphasizes that all electrons should flow through without being stored and that there should be a voltage drop across the bulb, indicating an energy change.
📈 Analyzing Data to Determine Ohmic Behavior of a Light Bulb
The second paragraph delves into modifying the experimental setup to determine if the light bulb exhibits non-ohmic behavior. Alan suggests adjusting the power supply and adding a resistor to vary the resistance. The data collection involves recording current and voltage measurements at different resistances. To analyze the data, Alan recommends plotting the current versus voltage to observe the linearity, which would indicate ohmic behavior. He acknowledges the limitations due to the accuracy of the measuring instruments and discusses the impact of uncertainties on the experiment's conclusions. The goal is to see if there's a linear relationship between current and voltage, which would help in determining whether the light bulb is ohmic or not.
Mindmap
Keywords
💡AP Physics
💡Incandescent light bulb
💡Series circuit
💡Resistor
💡Current
💡Ammeters
💡Voltmeters
💡Ohmic and non-Ohmic
💡Experiment procedure
💡Uncertainties
💡Data analysis
Highlights
Alan from Bothell STEM continues to explore AP Physics 1 with the 2015 free response questions.
The discussion focuses on understanding what gets used up in an incandescent light bulb when in series with a resistor.
Students are provided with equations to analyze the flow of electrons and the electric potential within the bulb.
An experiment is proposed using an adjustable power source, insulated wire, light bulbs, resistors, switches, voltmeters, and ammeters.
The experiment aims to measure the current entering and leaving the bulb to determine if electrons are stored inside.
Ammeters are set up in series to measure the difference in current, indicating electron storage, which is theoretically not expected.
A second experimental setup involves using voltmeters to measure the electric potential change within the bulb.
The importance of accurate voltage and current measurements is emphasized for a valid experiment.
The setup is adjusted to determine if the light bulb is non-ohmic by varying the resistance and recording the data.
Data analysis involves plotting I1 versus V to assess the linearity and determine the bulb's ohmic behavior.
Uncertainties in voltmeters and ammeters are considered when evaluating the linearity of the current-voltage graph.
Alan offers free homework help on Twitch or Discord for those with questions on math and physics.
The video concludes with an invitation to join Alan's community for further learning and discussion.
The experiment's analytical method is explained, focusing on the significance of error margins and the validity of conclusions.
The importance of adjusting the setup to account for non-ohmic behavior in the light bulb is discussed.
Alan emphasizes the need for a thorough understanding of the experimental setup and data analysis for accurate results.
The video provides a detailed walkthrough of the experiment's procedure and the rationale behind each step.
Transcripts
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