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Understanding Electromagnetism: Solenoids, Motors, and Generators

Explore the principles of electromagnetism, including solenoids, electric motors, and generators. Learn how electrical energy can be transformed into mechanical energy and how magnetic fields play a crucial role in these processes.

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Understanding Electromagnetism: Solenoids, Motors, and Generators

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  1. Table of Contents • What Is Electromagnetism? • Electricity, Magnetism, and Motion • Electricity From Magnetism

  2. - What Is Electromagnetism? Electric Current and Magnetism • An electric current produces a magnetic field.

  3. - What Is Electromagnetism? Solenoids • The magnetic field produced by a current has three distinct characteristics. The field can be turned on or off, have its direction reversed, or have its strength changed.

  4. - What Is Electromagnetism? Solenoids • The magnetic field around a solenoid resembles that of a bar magnet.

  5. - What Is Electromagnetism? Electromagnets • A doorbell rings as the magnetic field of an electromagnet turns on and off.

  6. - What Is Electromagnetism? Electromagnets • Electromagnets are used to lift heavy objects. A switch is turned on in the crane so that a current is produced in the electromagnet.

  7. - What Is Electromagnetism? Identifying Main Ideas • As you read the section “Solenoids,” write the main idea–the biggest or most important idea–in a graphic organizer like the one below. Then write three supporting details that further explain the main idea. Main Idea A solenoid is useful because its magnetic field can be changed. Detail Detail Detail Its magnetic field can be turned on and off. Its magnetic field can have its direction changed. Its magnetic field can have its strength changed.

  8. - What Is Electromagnetism? Links on Electromagnetism • Click the SciLinks button for links on electromagnetism.

  9. End of Section:What Is Electromagnetism?

  10. Electricity, Magnetism, and Motion Electrical Energy and Motion • When a wire with current is placed in a magnetic field, electrical energy is transformed into mechanical energy.

  11. Electricity, Magnetism, and Motion Galvanometers • An electric current is used to turn the pointer of a galvanometer.

  12. Electricity, Magnetism, and Motion Electric Motors • An electric motor transforms electrical energy into mechanical energy.

  13. Electricity, Magnetism, and Motion Outlining • As you read, make an outline about the section that you can use for review. Use the red headings for the main ideas and the blue headings for the supporting ideas. Electricity, Magnetism, and Motion • Electrical Energy and Motion • Types of Energy • Energy Transformation • Galvanometers • Electric Motors • How a Motor Works • Parts of a Motor

  14. Electricity, Magnetism, and Motion Links on Electric Motors • Click the SciLinks button for links on electric motors.

  15. End of Section:Electricity, Magnetism, and Motion

  16. - Electricity From Magnetism Induction of Electric Current • An electric current is induced in a conductor when the conductor moves through a magnetic field.

  17. - Electricity From Magnetism Induction of Electric Current • If a magnet moves through a coil of wire, a current is induced in the wire.

  18. - Electricity From Magnetism Generators • A generator uses motion in a magnetic field to produce an electric current.

  19. - Electricity From Magnetism Motors and Generators Activity • Click the Active Art button to open a browser window and access Active Art about motors and generators.

  20. - Electricity From Magnetism Generators • In most generators, a source of mechanical energy turns huge turbines such as this one. The turbine is attached to the armature of a generator, which produces current.

  21. - Electricity From Magnetism Transformers • A transformer is a device that increases or decreases voltage.

  22. - Electricity From Magnetism Types of Transformers • Voltage can be changed depending on the number of loops in the primary and secondary coils.

  23. - Electricity From Magnetism Previewing Visuals • When you preview, you look ahead at the material to be read. Preview Figure 13. Then write two questions that you have about the diagram in a graphic organizer like the one below. As you read, answer your questions. Generators Q. What are the parts of a generator? A. Magnets, crank, slip ring, armature, and brushes are parts of a generator. Q. How is a current induced in the armature? A. As a crank is turned, the armature rotates in a magnetic field. The rotating motion of the armature induces a current in the wire.

  24. - Electricity From Magnetism Transformers • Click the Video button to watch a movieabout transformers.

  25. End of Section:Electricity From Magnetism

  26. Graphic Organizer Electromagnetism is applied in a Generator Electric motor which is the opposite of turned by a large transforms electrical energy into producing Mechanical energy Turbine Electric current

  27. End of Section:Graphic Organizer

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