About This Chapter
Overview of Current Electricity- Chapter Summary
This chapter contains lessons that provide a thorough explanation of current electricity. Lessons cover the various types of potentiometers, the causes of electric currents, and information about electron mobility. Other lessons look at the relationship between voltage, current and resistance, and give the formula for drift velocity of charge carriers. This chapter will go over the following objectives and show you how to:
- Distinguish the differences between insulators and conductors
- Recognize types of electric current
- Analyze the components of Ohm's law
- Identify how electrical resistance works
- Explore resistance in the three main kinds of circuits
- Discuss Kirchhoff's rules
Our instructors will walk you through each lesson using real-world examples to increase retention. They present these lessons to you in fun and engaging ways. As you work your way through the chapter, watching the video lessons, reading the lesson transcripts and taking the self-assessment quizzes, know that our instructors are there every step of the way. If you are struggling to understand a concept, you can ask our instructors any questions you may have.
1. Insulators and Conductors: Examples, Definitions & Qualities
In this lesson, we'll explore the reasons that some materials conduct electrical energy with ease while others block it almost completely. We'll also talk about the property of conductivity and some everyday examples of insulators and conductors.
2. Drift Velocity & Electron Mobility: Definitions & Formula
Electric charge moving through a conductor is electric current. Mobile charge carriers don't have a straight path through a conductor. This lesson describes the drift velocity of charge carriers and how to calculate it.
3. 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.
4. 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.
5. 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.
6. Finding the Equivalent Resistance: Series, Parallel & Combination Circuits
How does resistance impact the way that electrical currents flow through a circuit That's what we are exploring in this lesson. We'll check out resistance in the three main kinds of circuits and practice calculating this value.
7. 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.
8. What is a Potentiometer? - Definition & Types
This lesson defines a potentiometer and a method to calculate the voltage output of a potentiometer. Two main types of potentiometers are discussed, linear and rotary, with some details on their construction.
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