About This Chapter
Understanding Principles of Electricity - Chapter Summary
The lessons in this chapter will help you understand the principles of electricity. You will go over how capacitors control an electric current and how common appliances use resistance to function. You will also get a better understanding of how to perform calculations involving electric fields. After completing the chapter, you should be prepared to:
- Explain Coulomb's Law, Gauss' Law, and Ohm's Law
- Draw electric field lines and vectors for charged particles
- Define electric potential
- Recall the physical significance of an electric dipole
- Explain how capacitors are created
- Discuss how electrical resistance works
- List components of an electric circuit
- Provide examples of Kirchhoff's rules
These lessons help you quickly grasp the principles of electricity, and our instructors facilitate an engaging learning experience. You can study all of the lessons or just focus on specific topics. Additionally, each lesson comes with a brief quiz to determine how much of the content you can remember.
1. Coulomb's Law: Variables Affecting the Force Between Two Charged Particles
In the 18th century, Charles Coulomb uncovered the secrets of electrostatic force between charged particles. The results of his experiments led to what is now known as Coulomb's Law, which tells us how force, charge, and distance are all related.
2. Electric Field & the Movement of Charge
After watching this video, you will be able to explain what an electric field is, draw electric field lines and vectors for charged particles, and complete calculations involving electric fields. A short quiz will follow.
3. What Is Electric Potential? - Definition & Formula
In this lesson, discover what electric potential is and how we measure it. Learn about the scientist Alessandro Volta and why his work led us to name a unit of measurement after him.
4. Finding the Electric Potential Difference Between Two Points
After watching this video, you will be able to explain what electric potential difference is and calculate the electric potential difference between two points in a uniform electric field. A short quiz will follow.
5. Dipole Fields: Definition & Examples
In this lesson, we will learn what a dipole field is, and how to calculate the electric field strength at different points in the field. We will also look at some example calculations.
6. Gauss' Law: Definition & Examples
After watching this video, you will be able to explain what Gauss' Law is, derive Gauss' Law for a sphere and cylinder, and use it to solve problems. A short quiz will follow.
7. What is Capacitance? - Definition, Equation & Examples
Capacitors are used to store and quickly release large amounts of electrical energy. In this lesson, we will learn how capacitors are created and used and how your body can function as a capacitor.
8. Capacitors: Construction, Charging & Discharging
Electrical circuits have several components, each of which must be understood for the system to work. We're going to check out capacitors in this lesson and see how they can be used to control an electric current.
9. What is Electric Current? - Definition, Unit & Types
Like a river current is the flow of water molecules, electrical current is the flow of charged particles. In this lesson, we're going to explore what electrical current is, what causes it, and that, unlike a water current, electrical current doesn't always flow in one direction.
10. Ohm's Law: Definition & Relationship Between Voltage, Current & Resistance
Did you know that electrical current is affected by the voltage and resistance in a circuit? In this lesson, we'll use Ohm's law, which tells us how current, voltage, and resistance are related, as we work through several electric circuit examples.
11. Electrical Resistance: Definition, Unit & Variables
We'll take a shopping trip to the mall to learn how electrical resistance works and how it is affected by resistivity, conductor dimensions, and temperature. We'll also take a look at several common appliances that take advantage of resistance to function.
12. Electric Circuit Fundamentals: Components & Types
Electric circuits can be configured to power several loads, such as light bulbs, in series or in parallel. In this lesson, we'll look at both types of circuits and see how the voltage, current, and resistance are affected by installing additional loads.
13. Applying Kirchhoff's Rules: Examples & Problems
Ohm's Law can be useful for analyzing simple circuits, but when circuits are more complex, as they often are, we can instead analyze the circuits using Kirchhoff's rules. Learn about Kirchhoff's rules in this lesson.
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