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Magnetism notes

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  • 1. 3.2E Current can produce magnetism pg.88EVocabularyElectromagnetism- Magnetism that results from an electric current.Electromagnet- Magnet made by placing a piece of iron or steel inside a coil ofwire.The discovery that an electric current can produce magnetism was made in the1800’s by Hans Christian Oersted.He discovered that an electric current produces a magnetic field.The relationship between electricity and magnetism plays an important role in themodern technology.The magnetic field produced as current flows it is represented with circlesaround the wire.An electromagnet can be constructed and the advantage of it is that themagnetism produced can be controlled, so you can apply it to differentuses.To make an electromagnet stronger you can:*Increase intensity of voltage source*Increase number of loops of wire in the coilElectromagnets are widely used in many electric devices, including:-Motors and generators-Electric bells-Loudspeakers-Magnetic recording and data storage:tape recorders, VCRs, hard disks, credit cards-Magnetic locks-Industrial lifting magnets-Electromagnetic suspension used for MAGLEV trains
  • 2. Because magnetism is a force, magnets can be used to move things.Electric motors convert the energy of an electric current into motion.Michael Faraday made the first simple electrical motor in 1821.Parts of a motor:*voltage source*shaft*commutator*magnet*electromagnetThey work like this:1. Like poles of the magnets push on each other2. As the motor turns, opposite poles attract3. The electromagnet’s are switched, and like poles again repelElectric motors are used in many, if not most, modern machines:FansBlendersMixersFood processorCD playerProject- Make an electromagnet, 3 member teams, counts as quiz

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