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Lesson Steps: Introduce E&M with Video; Explorer learning registration; Ready, Set, Gizmo! Do Now: What do you know about electrons, protons and current? Homework: None – yet… Lesson Steps: Introduce the big picture LIBRARY 1. 2. E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! All of this will be due on 4/17, so pace yourself accordingly! Do Now: Get a copy of “Pith Ball Lab” and attach it to your notebook. Homework: None – yet… Since you are now responsible for vocab terms and questions to go along with the notes, you can expect a notebook quiz at the end of each assignment. I WILL go over correct definitions/answers with you in class before the quiz. However, it is YOUR job, not mine, to make sure that you have the correct definition. Your classwork grades will be dependent on completeness, citations and effort. NOT CORRECTNESS. You can expect a notebook quiz before we begin chapters 19 and 20. That means April 19th and 20th. Lesson Steps: Introduce the big picture LIBRARY 1. 2. E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! All of this will be due on 4/18, so pace yourself accordingly! Do Now: Get a copy of “Pith Ball Lab” and attach it to your notebook. Homework: None – yet… Since you are now responsible for vocab terms and questions to go along with the notes, you can expect a notebook quiz at the end of each assignment. I WILL go over correct definitions/answers with you in class before the quiz. However, it is YOUR job, not mine, to make sure that you have the correct definition. Your classwork grades will be dependent on completeness, citations and effort. NOT CORRECTNESS. You can expect a notebook quiz before we begin chapters 19 and 20. That means April 19th and 20th. 1. 2. 3. Answer all “Questions” in your notebook. Cite where you found your answers if you looked ‘em up (but I would recommend your textbook here…). Define any term that is underlined and italicized in your notebook. You may use your textbook, a dictionary or the internet. CITE YOUR SOURCE, even if it’s yourself! Bookwork! (in your notebook) Weird… it all goes in my notebook…! Chapters 17 - 20 Objectives: Understand basic properties of electric charge Differentiate between conductors and insulators and the 3 methods of charging Coulomb’s Law Electric Field strength Two types of charge carriers: protons (positive) and electrons (negative). Their charge is conserved and quantized. Question 1: What is the charge/mass of a proton? An electron? Include units! Question 2: Who figured this out? How? There are two types of materials: conductors and insulators. Three ways to charge an object: contact, induction and polarization. Question 3: What methods of charging work for what materials? Coulomb’s Law describes the FORCE generated by two electric charges separated by a distance: 𝑞 1 𝑞2 𝐹𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 𝑘𝐶 2 𝑟 Question 4: What do each of these variables stand for? What are the units? Question 5: Write a word problem for your new equation! (Check out the book if you need some examples.) Electric Force is a field force, much like gravity. Question 6: Which field force is stronger, gravity or electric force? What do they have in common? The electric field is represented with the following equation which supposes that a small, positive test charge (q0) is brought in to test the strength of the field made by q. 𝑘 𝐶𝑞 𝐹𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 𝐸= 𝑞 = 2 0 𝑟 Question 7: What is the equation for the electric field strength from a point charge? Electric field lines always point from a positive charge to the negative charge. Question 8: Draw the electric field lines for a: a) b) +3 C charge and a -6 C charge at a distance, r. +3 C charge and a +6 C charge at a distance, r. Conductors in electrostatic equilibrium follow four main rules: 1. 2. 3. 4. The E-field is zero inside the conductor Any excess charge is on the surface The E-field just outside the conductor is perpendicular to the surface If the surface is irregular, the majority of the charge will be at the sharp points. Question 9: Draw this for both a sphere and an irregular shape of your choice. Objectives: Define and compute electrical potential energy for various charge distributions Distinguish between electrical potential energy, electric potential and potential difference Calculate the capacitance of various devices and how much energy is stored in a capacitor There are two equations for electric potential energy: In a uniform electric field: 𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = −𝑞𝐸𝑑 For a pair of charges: 𝑞1𝑞2 𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 𝑘𝐶 𝑟 Question 10: What do each of the variables stand for? What are their units? It is important to understand the difference between electric potential and potential difference. Question 11: What is this difference? (Explain in your own words!) There are three equations for potential difference. General: ∆𝑉 = ∆𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 𝑞 In a uniform electric field: ∆𝑉 = - E∆d Between a point charge and a point charge at 𝑞 infinity: ∆𝑉 = 𝑘𝐶 𝑟 Question 12: What do each of the terms mean? What are their units? Capacitance is used in a lot of electric circuits, from cars to radios. The most general equation that represents it is: 𝑄 𝐶= ∆𝑉 In some cases, capacitance takes place in a vacuum. That is defined as: 𝐶 = 𝜀0 𝐴𝑑 Question 13: What is capacitance dependent on? Question 14: How do you use a capacitor in a circuit? You can relate the electric potential of a circuit to the capacitance though: 𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 12𝑄∆𝑉 Question 15: What do each of the variables in these 3 equations stand for? What are their units? Page: Number: 633 1 636 2a 669 18A: 2; SR: 1, 2 673 1 675 4 681 2 1. 2. 3. Answer all “Questions” in your notebook. Cite where you found your answers if you looked ‘em up (but I would recommend your textbook here…). Define any term that is underlined and italicized in your notebook. You may use your textbook, a dictionary or the internet. CITE YOUR SOURCE, even if it’s yourself! Bookwork! (in your notebook) Weird… it all goes in my notebook…! Lesson Steps: Keep on with everything that is due in class on 4/17 (that’s next class…): E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! Do Now: What do you know about electrons, protons and current? Homework: Make sure you have enough done to hand everything in on Tuesday by the last 30 minutes of class! Lesson Steps: Keep on with everything that is due in class on 4/18 (that’s next class…): E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! Do Now: What do you know about electrons, protons and current? Homework: Make sure you have enough done to hand everything in on Wednesday by the last 30 minutes of class! Lesson Steps: LIBRARY! Everything is due by the last 30 minutes of class TODAY! Then go over solutions! E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! Do Now: Any big questions about the work you’re turning in? Homework: None, you should be done! Lesson Steps: LIBRARY! Everything is due by the last 30 minutes of class TODAY! Then go over solutions! E&M Notes Assignment 1 (Vocab, Bookwork and Questions) Explorer learning registration Gizmo! Do Now: Any big questions about the work you’re turning in? Homework: None, you should be done! We will start chapters 19 and 20. You can expect Assignment 2 due sometime the following week. Objectives: Describe and solve problems relating to electric current. Understand various speeds and types of current. Understand and be able to calculate resistance. I = ΔQ/Δt ΔV = IR Relate and calculate electric power to known terms. P = IΔV = I2R = ΔV2/R Objectives: Interpret and construct circuit diagrams Differentiate and calculate equivalent resistance of resistors Differentiate and calculate equivalent current In series: Req = R1 + R2 + R3 + … In parallel: 1/Req = 1/R1 + 1/R2 + 1/R3 + … In series: 1/Ieq = 1/I1 + 1/I2 + 1/I3 + … In parallel: Ieq = I1 + I2 + I3 + … Understand and apply the concept that magnets can induce a current (p. 776)