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Campus: Princeton High School Author(s): Naureen Fielding, Meaghan Hodapp Date Created / Revised: 04 March 2015 Six Weeks Period: 5 Grade Level & Course: 11th and Physics Timeline: 15 Days Unit Title: Current Electricity Stated Objectives: TEK # and SE Lesson # 1 P.5 The student knows the nature of forces in the physical world. The student is expected to: P.5E Characterize materials as conductors or insulators based on their electrical properties. P.5F Design, construct, and calculate in terms of current through, potential difference across, resistance of, and power used by electric circuit elements connect in both series and parallel combinations. See Instructional Focus Document (IFD) for TEK Specificity Key Understandings Electric current is the flow of electrons. By convention, electric current is the direction in which a positive test charge moves. An electrical circuit transforms electrical energy into thermal or mechanical energy. Resistors can be combined in different ways to make a series or parallel circuit. In a series circuit, the charge travels along one path. In a parallel circuit, the charge is divided into two or more paths. Most circuits are a combination of parallel circuits. It is important to understand the consequences, causes, and prevention of electrical overloads and high voltage shock to persons and equipment. Misconceptions Students confuse voltage and current with the electric charges that are moving. Students may think current flows around a complete circuit and is used by objects like light bulbs, so less current returns than leaves the source of the electricity. Changing the order of resistors in a series circuit does not affect the behavior of the circuit. Students may think that current flows from a battery to a light bulb, but not from the light bulb to the battery. Key Vocabulary Ohm’s Law Conductor Resistor Circuit Potential difference Ammeter Voltmeter Direct current alternating current capacitor power short ground battery resistance electric force voltage current multimeter series circuit parallel circuit bulb LED Materials, Resources, Notes Suggested Day 5E Model Instructional Procedures Day 1 Engage Engage: Making a battery. View the short video clip about how a battery works. Connect the terms anode and cathode to anion and cation. Hand out the PhyzGuide: Batteries and Current note sheet. Students are to read the front page about Luigi and Alessandro and explain how Alessandro Volta’s attempt to replicate Luigi’s experiment resulted in the construction of the first battery. Explain what Volta had to understand to construct this “battery.” Use Battery Resistor simulation to demonstrate battery from Colorado Phet Use Chp. 22 Mini-Lab Making Electric Energy or PhyzLab Springboard The Lemon Battery or both to allow students to construct a battery and label the cathode, anode, electrolyte. Students should diagram their creation and label it correctly as well as complete the worksheets that accompany the lab. Students my use the Phyzguide handout to assist them. Write up can be completed for homework. Day 2 Engage Engage: Provide students with materials and the LaunchLab Light the Bulb. Students construct and diagram everything that they build. Students connect the relationship between the battery and the circuit. Day 3 Explain Explain: Show this video clip differentiating current and voltage. Have students take individual notes. Complete PhyzGuide: Circuit Basics as whole-class instruction. Guide students to understanding of electricity, current, voltage, electric potential resistance (resistors). Complete the PhyzGuide: The Slider Circuit worksheet provides an effective analogy to the electrical concepts of a circuit. Continue building the analogy between the slide, a water system and an electrical circuit. Start the PhyzJob Playground Physics 101 with students. Have them complete for homework. Capacitors can be introduced on this day as well. Explain how they are similar to batteries. Use Colorado Phet sim to demonstrate. Explain: Correct selected examples from the homework and collect. Extend: Use the Phyz Springboard Current and Voltage activity sheet to introduce students to analog meter scales and differentiating current and voltage. Evaluate: Use questions 11, 12, 13 do complete group work for explanations. Students in groups of three each assigned one question must answer it and then present it to group members. Groups must use class materials, computers, background knowledge to check each other and present group answers. 2 grades. Day 4 Explain/ Extend/ Evaluate (Engage, Explore, Explain, Extend/Elaborate, Evaluate) https://www.youtube.com/watch?v=KkRwuM4S8BQ http://phyz.org/phyz/BOP/10-CIRCUITS/GBatteries_Current.pdf http://phyz.org/phyz/BOP/10-CIRCUITS/JLemon_Battery-LSB.pdf McGraw Hill Chp. 22 Mini lab https://phet.colorado.edu/en/simulation/batteryresistor-circuit McGraw-Hill LaunchLAB Chapter 22 Light The Bulb https://www.youtube.com/watch?v=1xPjES-sHwg http://phyz.org/phyz/BOP/10-CIRCUITS/GCircuit_Basics.pdf http://phyz.org/phyz/BOP/10-CIRCUITS/GCircuit_Slider.pdf https://phet.colorado.edu/en/simulation/capacitorlab http://phyz.org/phyz/BOP/10-CIRCUITS/JCurrent_Voltage-SB.pdf Expand: Provide students with Transparency 1 and 2 from chapter 22. These detail the components and symbols for components of an electrical circuit. Once students have completed the transparencies, provide students with opportunity to build and then diagram circuits from Stephen Murray worksheet and lab sheet Voltage in Circuits. Students complete the open bottom part of lab using bulbs of different resistance. Students then look for patterns in voltage drop and reading from front to complete top half of back page. Elaborate: Introduce students to resistors and Ohm’s Law. Use Colorado Phet Ohm’s Law simulation to introduce. Use McGraw Hill’s Enrichment Ohm’s Law from Chapter 22 to introduce the mathematical relationship between V, I, r. Review pages 604-607 in textbook. Solve example problem and 13-17 together in class. After example, break class into 4 groups- assign each person a problem-give them 5 minutes to struggle or be successful with it then group students with the same problem and have them prepare to share with the class how to complete the problem. All students should complete the problems and use them to complete the Enrichment handout in class or for homework. Read the connection to health and have students complete a quickwrite if time allows. Extend: Students complete Circuit Guizmo or related Colorado Phet to differentiate series and parallel circuits. Students may have already discovered the brighter lights of parallel circuits, but use this instructional tool to clarify concepts and introduce differences in resistors (resistance) and Ohm’s Law. Text book pages include 608. Use simulation for DC only. AC will be discussed, but we do not use it in any labs because it is dangerous, so students only need to differentiate, not use. Day 8 Evaluate Evaluate: Provide students with Stephen Murray worksheets Circuits and Symbols and Types of Circuits and Ohm’s Law. Students may work in partners or independently to complete in class. They may use notes or reread information from the front of the activity sheets. Must be completed in class. Stephen Murray worksheets for circuits and ohms law to formatively assess student comprehension Day 9 Extend Extend: Voltage, Current and Resistance lab with multiple resistors. Use lab from McGraw Hill and resistors. Circuit Homework from Hodapp’s resources. Voltage, Current and Resistance lab from McGraw Hill Elaborate: Present and review with the class transparencies 1 and 2 from chapter 23 on series and parallel circuits before introducing them to calculating total resistance using Stephen Murray Total Resistance worksheet. Work through 1-8 with students. Assign students to complete 8-18 and have them share on the board with the class. Use Colorado Phet to simulate different resistors and Day 5 Expand Day 6 Elaborate Day 7 Extend Day 10 Elaborate McGraw Hill transparencies 1 and 2 for chapter 22. Voltage in Circuits Stephen Murray worksheet Circuit building materials and voltmeter McGraw Hill Enrichment Ohm’s Law chpt. 22 https://phet.colorado.edu/en/simulation/ohms-law Explore Learning Guizmo for electrical circuits or Colorado Phet for electrical circuits. Differentiating series and parallel https://phet.colorado.edu/en/simulation/circuitconstruction-kit-dc https://phet.colorado.edu/en/simulation/circuitconstruction-kit-ac McGraw Hill transparencies and Stephen Murray Total Resistance worksheet for review https://phet.colorado.edu/en/simulation/resistancein-a-wire calculating resistors in series and parallel circuits. Extend: Students complete Conceptual Physics resistance practice activities in partners or small groups. Teacher monitors and assists. As students finish, they independently read pages 609-612 and complete transparency 4 from McGraw Hill chapter 22. Day 12A Explain/ Elaborate Explain: Electrical transmission explained through lab of Conservation of Energy, McGraw Hill chapter 22. Complete if heating coil is available or other source to convert electricity into thermal energy is available. Cut this day if materials not available. McGraw Hill Conservation of Energy Lab-NEED HEAING COIL Day 12B Extend Extend: Introduce complex circuits using Transparency 4 Chapter 23. Complete Simplifying Complicated Circuits from Stephen Murray. Complete some as class and the remainder independently. Introduce Power as a measure of electrical energy transfer. VIR and P homework from Hopapp’s resources. Transparency 4 chapter 23 Stephen Murray Simplifying complicated circuits Day 13 Evaluate Evaluate: Use Forensics Lab 6 Circuit Configuration to assess student understanding of resistors in series and parallel. Complete lab questions for homework. Forensics Lab 6, Circuit Configuration Day 14 Elaborate Elaborate: And Practice- Provide students with copies of Stephen Murray V,I, r for series and parallel circuits. Also provide review for unit quiz Stephen Murray worksheets for V, I, r calculations Day 15 Evaluate Evaluate: Unit Quiz Unit can be extended one day as Magnetism unit will start in fifth six weeks, but finish in sixth six weeks. Unit Quiz Day 11 Extend Accommodations for Special Populations Conceptual Physics Resistor calculation practice sheet Chp 22 Transparency 4 for electricity transmission Accommodations for instruction will be provided as stated on each student’s (IEP) Individual Education Plan for special education, 504, at risk, and ESL/Bilingual.