Step 1. Questions
You are probably very familiar with magnets. You have probably observed the two poles attract and repel in science class. At home there may be magnets holding your special papers and pictures on the refrigerator. These are permanent magnets. Their magnetism comes from the motions of electrons in an atom. Non-magnetic objects can be made temporarily magnetic by running an electric current through it. They are electromagnets.
Although you may not be as familiar with electromagnets you probably have more of them in your house than permanent magnets. If you have a kitchen toaster, cell phone, stereo speaker, television screen, or numerous other appliances then you are familiar with the use of electromagnets! In this research project you are going to learn more about electromagnets and how they work. The following questions will help you get started:
By using the following Web sites you can answer these questions, as well as some of your own. When your research is complete, use the steps that follow to develop a written report presenting your findings.
- What is an electromagnet?
- What is a magnetic field? How is it produced?
- How does the number of turns on the wire relate to the strength of the electromagnet?
- What are some common uses of electromagnets?
Step 2. Research
Research answers for the questions you were asked in Step 1. Visit these Web sites. Take notes about them on this page, too!