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Magnetism and Electromagnetism

Magnetism and Electromagnetism. Industrial Technology Electrical Systems. Magnet. A magnet is a piece of iron oxide or special alloy that exerts an invisible force of attraction on objects made of iron, nickel, or cobalt.

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Magnetism and Electromagnetism

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  1. Magnetism and Electromagnetism Industrial Technology Electrical Systems

  2. Magnet A magnet is a piece of iron oxide or special alloy that exerts an invisible force of attraction on objects made of iron, nickel, or cobalt. Magnetism is the property a material to attract pieces of iron or steel

  3. Artificial Magnets • Non-natural or artificial magnets are made from un-magnetized magnetic materials such as flat bar iron oxide. • Magnetic materials are those materials that magnets attract. Some common magnetic materials are iron, steel, nickel, and cobalt. • Nonmagnetic materials are copper, aluminum, lead, silver, brass, wood, glass, liquids, and gases.

  4. Artificial Magnets • Most artificial magnets are produced electrically by wrapping an insulated wire around magnetic material and running direct current through the wire.

  5. Magnetize Magnetic Materials • You can also magnetize magnetic materials by rubbing them across the poles of magnets. This is done for screwdrivers, needles, etc.

  6. Laws of Magnetic Poles • Unlike poles attract • Like poles repel Every magnet has both a North and a South pole

  7. Magnetic Lines of Flux • The invisible area around a magnet where the magnetic force is evident is called the magnetic field. • Magnetic lines of Flux are evident by sprinkling iron filings in the area around the magnet. • Attraction is strongest at the poles and weakest in the middle.

  8. Magnetic Lines of Flux • Lines of flux never cross one another. • Magnetic lines of Flux form closed loops from pole to pole. • Lines of flux run from North to South outside the magnet and from South to North inside the magnet. • There is no known insulator from magnetic lines of flux.

  9. Uses for Permanent Magnets • Hand-help generated flashlights and radios • DC motors to covert electrical energy into mechanical energy • Loudspeakers • Switches • Meters

  10. ELECTRO-MAGNETS • Whenever electrons flow through a conductor, a magnetic field is produced. • Electromagnetism is the magnetic effects of current.

  11. Electro-Magnets • When a coil of insulated wire is wound over a core of magnetic material, the device becomes a practical electromagnet. • When the current flows through the coil, the core becomes magnetized. • When the current stops, both the coil and the core lose their magnetism

  12. Uses for Electromagnets • Scrap Iron Crane Magnet • Motors and Generators • Solenoid, valves, clutches, switches • Transformers • Electric bell

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