Praxis General Science: Magnetism & Electricity - Videos & Lessons

About This Chapter

This chapter helps you reinforce your knowledge of magnetic forces, magnetic fields, electric current, and electric circuits as you prepare for the Praxis General Science exam.

Praxis General Science: Magnetism & Electricity - Chapter Summary

Our professional instructors teach this series of short, engaging lesson videos to help you review the properties, forces and components of magnetism, magnetic fields, electric current and electric circuits. These lessons are mobile device compatible, thus giving you access to a portable way to ensure you can:

Understand poles and dipoles of magnetic forces
Define magnetic fields
Identify the units and types of electric current and resistance
Describe components and types of electric circuits
Define an electromagnet and its parts
Explore electric charge and force
Compare insulators and conductors
Describe Ohm's law and voltage sources

In additions to watching the lesson videos, you can also read the lesson transcripts to improve your retention of the material presented. Take the lesson quizzes to determine what topics you don't understand and then use the video tags to reinforce your understanding of those topics. Once you have finished all the lessons and quizzes in this chapter, take the chapter exam to test your overall understanding of the chapter.

11 Lessons in Chapter 12: Praxis General Science: Magnetism & Electricity

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1. Magnetic Force: Definition, Poles & Dipoles

You're probably familiar with magnets, but have you ever stopped to consider how they work? In this lesson, we'll look at the root of magnetism and some of the fundamental properties of magnets.

2. What is a Magnetic Field?

Magnetic fields fill the space around all magnets, but they're impossible to detect with our own senses. We'll use a common tool to map out a magnetic field and then discuss ferromagnetic materials to see how a magnetic field can be used to create new magnets.

3. What is an Electromagnet? - Definition, Uses & Parts

In this lesson, you'll learn what an electromagnet is, how it is used in a few real-life situations, and the parts that make it up. A short quiz will follow.

4. Electric Charge and Force: Definition, Repulsion & Attraction

Have you ever wondered what electricity is and where it comes from? Have you ever been zapped by static electricity and wondered how it got there? We'll answer all of these questions in this lesson on electric charge and force!

5. Electric Force: Definition & Equation

The electric force is one of the most powerful, fundamental forces in the universe. In this lesson, we will learn how charged objects exert electric forces on each other and how to calculate the strength of that force.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. Voltage Sources: Energy Conversion and Examples

We use them every day, but no one really gives them much thought. What are we talking about? Why, voltage sources, of course! Batteries and generators are two of the most common sources of voltage that power our daily lives. We'll look at them in detail to see how they work.

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