# Ch 7: Electricity & Magnetism

### About This Chapter

## Electricity & Magnetism - Chapter Summary

Use the video lessons in this chapter to reinforce the knowledge your middle school students have already gained regarding electricity and magnetism. The videos, usually less than 10 minutes, help students learn more about series and parallel circuits, electric potential and electrical resistance. Students can also take a closer look at magnetic fields and forces, examining what they are and how they are created. The lessons challenge students to analyze electromagnetic induction and also learn about converting between electrical and mechanical energy in electric motors and generators. Self-assessment quizzes are available to assess your students' comprehension of the materials. You can also contact instructors if you have questions about this chapter.

## Chapter Lessons and Objectives

Lesson | Objective |
---|---|

Electric Charge and Force: Definition, Repulsion & Attraction | Students explore the definition of electric charge and force, as well as repulsion and attraction. |

Coulomb's Law: Variables Affecting the Force Between Two Charged Particles | In this lesson, students examine Coulomb's Law to take a closer look at variables affecting the force between two charged particles. |

Electric Potential: Charge Collections and Volt Unit | Students learn about electric potential, including charge collections and volt unit. |

Voltage Sources: Energy Conversion and Examples | Instructors help students examine the definition and examples of voltage sources. |

What is Electric Current? - Definition, Unit & Types | Students discover the definition of electric current, as well as unit and types. |

Electrical Resistance: Definition, Unit & Variables | Students analyze the definition, unit and variables of electrical resistance. |

Ohm's Law: Definition & Relationship Between Voltage, Current & Resistance | This lesson helps students understand the definition of Ohm's Law and examine the relationship between voltage, resistance and current. |

Series Circuits: Definition & Concepts | Students study the definition and concepts of series circuits. |

Parallel Circuits: Definition & Concepts | Student explore the definition and concepts of parallel circuits. |

What is Electric Power? | In this lesson, students learn the definition of electric power. |

Magnetic Force: Definition, Poles & Dipoles | Instructors help students define magnetic force and learn more about poles and dipoles. |

What is a Magnetic Field? | Students discover the definition of magnetic field in this lesson. |

How Magnetic Fields Are Created | This lesson helps students understand how magnetic fields are created. |

How Magnetic Forces Affect Moving Charges | Students can learn how magnetic forces affect moving charges in this lesson. |

Electromagnetic Induction: Definition & Variables that Affect Induction | Instructors help students define and identify variables that affect electromagnetic induction. |

Electromagnetic Induction: Conductor to Conductor & Transformers | Students can learn more about conductor-to-conductor electromagnetic induction and transformers. |

Electric Motors & Generators: Converting Between Electrical and Mechanical Energy | In this lesson, students take a closer look at electric motors and generators, along with the process of converting between electrical and mechanical energy. |

### 1. 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!

### 2. 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.

### 3. Electric Potential: Charge Collections and Volt Unit

In this lesson, we'll find out that electric charges can be rather lazy until something motivates them to get work done. Find out what gives electric charges the potential to do work and how we measure that potential with something called voltage.

### 4. 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.

### 5. 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.

### 6. 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.

### 7. 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.

### 8. Series Circuits: Definition & Concepts

When you flip a switch to turn your lights on, you are completing a circuit and providing a pathway for electrons to flow. In this lesson, you'll learn how connecting devices in a series along that circuit affects the current and resistance throughout.

### 9. Parallel Circuits: Definition & Concepts

People moving through an airport are similar to electrons moving through a circuit. Parallel circuits are one type of simple circuit, and they get their name from the multiple, parallel paths they provide for electron flow.

### 10. What is Electric Power?

Power is a word we use all the time, but do you really know what it means? We'll look at how electrical power relates to voltage, current and resistance and how knowing that relationship can help you in everyday life.

### 11. 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.

### 12. 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.

### 13. How Magnetic Fields Are Created

Have you ever wondered how magnetic fields are created? In this lesson, we'll discuss the very simple answer to this question and look at how electric current can be used to make electromagnets, which have many everyday applications.

### 14. How Magnetic Forces Affect Moving Charges

A magnetic field exerts a force on a moving charged particle in ways that you might not expect. In this lesson, we're going to look at the direction of this force and the factors that affect its strength.

### 15. Electromagnetic Induction: Definition & Variables that Affect Induction

We use electromagnetic induction every day, but do you have any idea what it is? In this lesson, we'll discuss this everyday phenomenon, the factors that affect its strength and its most common applications.

### 16. Electromagnetic Induction: Conductor to Conductor & Transformers

Every day, we make use of a special case of electromagnetic induction known as mutual induction. In this lesson, we'll talk about this special phenomenon and how it is used in many common devices.

### 17. Electric Motors & Generators: Converting Between Electrical and Mechanical Energy

Both generators and electric motors are common devices in everyday life, but how do they work and what is the difference between them? In this lesson, we'll explore both of them, which may produce different results but are actually more similar than they may seem.

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### Other Chapters

Other chapters within the Physics: Middle School course