When charged particles from the sun are pulled toward the North or South Pole, they may cause colorful lights in the night sky.
Self Direction
How does an electric motor work?
An electric motor is a device that converts electrical energy into mechanical energy. You will learn how electric motors work in Section 21.2. Use the library or Internet to research how to build a simple kind of electric motor called a stripped-down motor. Document your progress by making a video or photo journal to post on a blog. Explain how each part of the stripped-down motor works.
How do science concepts apply to your world? Here are some questions you'll be able to answer after you read this chapter.
What causes two magnets to push and pull each other, even when they aren't touching? (Section 21.1)
How do electric motors work? (Section 21.2)
How do loudspeakers use magnets to change electrical signals into sound? (Section 21.2)
How do doctors use magnetic fields to see inside the human body? (page 640)
How is electric current generated? (Section 21.3)
How does electric current get to your home? (Section 21.3)