TCAP LESSON 19

1. TCAP LESSON 19 ELECTRONMAGNETISM AND MANETIC FIELDS

2. VOCABULARY FOLDABLE I • Magnetic Force • Is a push or pull exerted by a magnet

3. Magnetic Field • The area surrounding a magnet in which the magnetic force exists

4. Electromagnetism • The production of a magnetic field by electric current

5. Electromagnet • A magnet that is made by passing an electric current through wire wrapped around an iron core

6. Electric Generator • Transforms magnetism into electrical energy

7. Electromagnetism and Magnetic Fields Notes page 5 • A magnet is a material that exerts an attractive force on certain other materials. • Magnets are mode of iron, nickel, cobalt, or a combination of these elements with other materials. • Magnets exert a force on these metals and other magnets • Magnets can be used to produce electricity and electricity can be used to produce magnetism.

8. Magnet Force • A magnet has two poles: a north pole and a south pole. One pole cannot exist without the other • If you cut a magnet in half, both pieces will have north and south poles • Each pole exerts a magnetic force • Whether the force is a push or pull depends on what object the magnet is affecting and whether the poles are alike or different • Alike poles, repel, opposite poles, attract

9. Magnetic Field • The magnetic force of a magnet is strongest at the poles but it exists around the entire magnet • Earth’s magnetic field tends to trap particles coming in from the sun. • Without the magnetic field, these particles might be harmful to living things on Earth’s surface.

10. Electricity and Magnetism • When current flows through a coil of wire, the magnetic field produced around the wire is similar to that surrounding a bar magnet.

11. Producing Electricity • In a generator, a magnet is made to move inside a wire coil. The magnet may be moved by flowing water, wind or high-pressure steam. • This is how electric power plants work • The movement of the magnet produces an electric current in the coil

12. Electromagnetism and Magnetic Fields HW pg. 4 • Which of the following could be used as the core of a simple electromagnet? • pencil c. iron nail • drinking straw d. aluminum foil 2. What will happen if the north poles of two magnets are moved toward each other • The poles will attract each other • The poles will repel each other • Nothing will happen • Electricity will be produced

13. HW 3. You have a coil of copper wire, a bar magnet, and an iron rod. What can you do with these items to produce an electrical current? • Place the wire near the north pole of the bar magnet • Move the bar magnet rapidly back and forth inside the wire coil • Touch the ends of the wire to the poles of the magnet • Bring the bar magnet near the end of the iron rod

14. HW 4. Which of the following materials is MOST LIKELY to be attracted to a magnet? • A piece of metal • A rubber ban • A wooden match • A cup of water

15. HW 5. What is the purpose of the iron core in an electromagnet? • To hold the loops of wire in place • To make the magnetic field stronger • To make the field have north and south poles • To change the direction of the magnetic field