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This course introduces the fundamental concepts of electric charge, electric force, and electric fields, using hand-drawn animations. This is excellent for students who are taking a physics class but need extra help understanding the material, whether it's because your teacher is hard to understand, you miss some lectures, or you'd simply like a fresh perspective.
Master the Core Concepts of Electricity & Magnetism in this Introductory Course
Boost Your Grades in Your Electricity & Magnetism Physics Course
This course will boost your physics grades by clearly explaining the fundamental introductory concepts and giving insight into what sorts of difficulties professors like to introduce in exams. Here, you will learn all about the first two chapters, on electric charge and electric fields, of a standard physics course on electricity and magnetism. The course author uses his experience teaching college physics to highlight the key ideas and dangerous misconceptions while having some fun with hand-drawn animations and some goofy examples.
At the end of this course, you will have a solid understanding of electric charges and electric fields, and you will know what mistakes to avoid so you can get better grades on your next test or exam.
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|Section 1: Introduction|
Welcome to the course! My #1 goal is to boost your physics grade, and I would love to hear your feedback on what I can do to make this course even better for you.
Here are some downloadable PDF files with practice questions that you can use to test your understanding.
|Section 2: Electric Charge and Electric Force|
The electric charge is the absolute first thing to master when learning electricity and magnetism. This lecture will quickly show you the key ideas so you can go smoothly through the rest of your course.
Conductors are quite different from insulators, and this lecture quickly shows you how. I also show you how objects can become charged, including a description of how to use the triboelectric series to determine which object will become positive (or negative) when two materials are rubbed together.
Charge polarization, which occurs when positive and negative charges are separated, explains how insulators can experience an electric force and sets up the foundation for understanding charging by induction in the next lecture.
When you charge an object by induction, you are charging it by using a different charged object but without actually touching the charged object. Many students misunderstand how this works, and this lecture will set you straight so you can ace this question on your exam.
Coulomb's Law tells us how to calculate the electric force between point charges. This idea becomes a cornerstone for the rest of the course because the electric force just keeps coming back.
|Section 3: Electric Fields|
Mastering the electric field, and the idea of the test charge, is one of the most important things you can do to ace your electricity and magnetism course. This lecture builds heavily on the comparison of the force of gravity and the idea of a gravitational field, to help you relate the electric force and field to something that's easier to grasp.
In this lecture, you will see two ways to determine the electric field caused by a point charge. Later in your course, you will use this idea to find the electric field from many point charges.
Electric field lines are used to visualize the direction of the electric field caused by one or more electric charges. This is a nice quick lecture, since it's a fairly straightforward idea.
When you place a moving point charge inside a constant uniform electric field, the result is just like projectile motion, with two big differences! First, the electric force can be in any direction - unlike gravity, which is typically vertically down. Second, the electric force direction depends on whether the charge is positive or negative - unlike gravity, in which masses are always attracted to each other.
Explore how to use calculus to determine the electric field of a continuous charge distribution by considering each tiny piece of charge, dq, as a point charge.
Also check the external resources for YouTube videos showing how to derive the electric field of a ring and a disk of uniform charge.
The permittivity constant seems to complicate things now, but it will be used much more in later parts of the course.
|Section 4: Gauss' Law|
Learn the high-level aspects of Gauss' Law that we'll dive into in the following lectures.
What is Flux?
Gauss' Law and Applications to Charged Insulators
Three Key Ideas about Conductors in Electrostatic Equilibrium
|Section 5: Electric Potential|
Introduction to Electric Potential and Electric Potential Energy
Electric Potential Energy
Electric Potential Energy of a System of Point Charges
Electric Field -> Potential Difference
Potential Difference -> Electric Field
|Section 6: DC Circuits Without Capacitors|
Introduction to DC Circuits Without Capacitors
Circuit Elements and Electric Current
Using a Voltmeter and/or Ammeter
Equivalent Resistance - Series and Parallel
Kirchoff's Current Law (Junction Rule)
Kirchoff's Voltage Law (Loop Rule)
Ideal vs Real emf
|Section 7: DC Circuits With Capacitors|
Introduction to Capacitors and Capacitance
What is a Capacitor? What about Capacitance?
Equivalent Capacitance - Capacitors in Series
Equivalent Capacitance - Capacitors in Parallel
Special Case: Parallel Plate Capacitor
Energy Stored in a Capacitor
RC Circuits (Charging and Discharging)
|Section 8: Magnetic Field|
Introduction to Magnetic Fields
Magnetic Field Lines
Magnetic Force on an Electric Charge
Motion of a Charged Particle in a Constant Uniform Magnetic Field
Magnetic Force on a Current-Carrying Wire
|Section 9: What's Next?|
Thank you so much for viewing my course! I hope that it can help boost your physics grade, and I would love to hear your feedback!
If you would like more information about how I can boost students' physics grades, check out this bonus material.
Scott started his career as a Mission Operations Analyst, performing tens of thousands of physics-based computer simulations of the robotic arms on the International Space Station, and providing real-time support to space shuttle missions, over a period of more than 7 years. Always passionate about teaching, Scott conducted some astronaut training at the Canadian Space Agency, and then transitioned to teaching physics at Vanier College in Montreal. After more than 3 years of teaching, Scott retired from full-time employment to spend more time with his growing family. Scott's teaching bug persisted, and Scott soon started tutoring college physics students and creating YouTube videos to help explain concepts at the right level for introductory college physics.