Integrated Science Unit 3, Chapter 10

Unit Three: Electricity and Magnetism Chapter 10 Magnets and Motors 10.1 Permanent Magnets 10.2 Electromagnets 10.3 Electric Motors and Generators

Chapter 10 Learning Goals Describe the properties of a permanent magnet. Describe the forces that magnets exert on other. Explain why materials like iron and steel are attracted to magnets. Explain why a compass points north. Build an electromagnet. Analyze how electric current affects the strength of the magnetic field in an electromagnet. List three ways that the strength of an electromagnet can be increased. Compare permanent magnets and electromagnets. List several applications of electromagnets. Explain electromagnetic induction. Describe how electric motors and generators work.

Chapter 10 Vocabulary Terms electromagnet electromagnetic induction generator magnet magnetic magnetic field intensity magnetic force permanent magnetic south pole

10.1 Permanent Magnets What effects do permanent magnets have? Key Question: What effects do permanent magnets have? *Read text section 10.1 AFTER Investigation 10.1

10.1 What is a magnet? A permanent magnet is a material that keeps its magnetic properties even when it is NOT close to other magnets.

10.1 Properties of Magnets Magnets have two opposite poles. north south Magnets exert forces on each other. The forces depend on the alignment of the poles.

10.2 Electromagnets Can electric current create a magnet? Key Question: Can electric current create a magnet? *Read text section 10.2 AFTER Investigation 10.2

10.2 Applications of electromagnets mag-lev train toaster doorbell

10.3 Electric Motors and Generators Key Question: How does an electric motor or generator work? *Read text section 10.3 AFTER Investigation 10.3

10.3 Using magnets to spin a disk Use a single magnet go attract and repel magnets in a rotor by flipping its poles.

10.3 Generating Electricity A power plant generator contains a turbine that turns magnets inside loops of wire to generate electricity.