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Ch. 22 - Magnetism PowerPoint PPT Presentation


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Ch. 22 - Magnetism. II. Uses of Magnetic Fields (p.628-632) Electromagnet Speaker Motor. A. Electromagnet. Electromagnet strong, temporary magnet formed when current is passed through a coil of wire surrounding an iron core acts like a bar magnet when current is on. B. Speaker. Speaker

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Ch. 22 - Magnetism

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Ch 22 magnetism l.jpg

Ch. 22 - Magnetism

II. Uses of Magnetic Fields

(p.628-632)

Electromagnet

Speaker

Motor


A electromagnet l.jpg

A. Electromagnet

  • Electromagnet

    • strong, temporary magnet formed when current is passed through a coil of wire surrounding an iron core

    • acts like a bar magnet when current is on


B speaker l.jpg

B. Speaker

  • Speaker

    • electrical energy  mechanical energy

  • wire coil moves back & forth as its magnetic field interacts with the field of a fixed magnet

  • forced vibration causes the cone to move  sound


C motor l.jpg

C. Motor

  • Motor

    • electrical energy  mechanical energy

  • electromagnet rotates between the poles of a fixed magnet

  • commutator reverses the poles of the e’magnet


C motor5 l.jpg

armature & commutator

assembled motor

brushes & wires to battery

field magnet

C. Motor


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