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Ch. 22 - Magnetism

Ch. 22 - Magnetism. III. Producing Electric Current (p.633-639) Electromagnetic Induction Electric Generator DC & AC Transformer. Coil. Dynamic Microphone. A. Electromagnetic Induction. Electromagnetic Induction producing a current by moving a wire through a magnetic field.

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Ch. 22 - Magnetism

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  1. Ch. 22 - Magnetism III. Producing Electric Current (p.633-639) Electromagnetic Induction Electric Generator DC & AC Transformer

  2. Coil Dynamic Microphone A. Electromagnetic Induction • Electromagnetic Induction • producing a current by moving a wire through a magnetic field • some microphones work just like mini-speakers in reverse • sound waves cause coil to move  current

  3. GENERATOR MOTOR B. Electric Generator • Electric Generator • mechanical energy  electrical energy • armature is rotated between magnet poles • magnetic field induces a current in the wire coil

  4. B. Electric Generator • Hydroelectric Dam • PE of lake water is converted to KE • mechanical KE turns the generator shaft which creates electrical energy

  5. C. DC & AC • Direct Current (DC) • current flows in one direction • dry cells • Alternating Current (AC) • current reverses its direction at regular intervals • electrical outlets

  6. D. Transformer • Transformer • increases or decreases AC voltage • primary coil AC produces a magnetic field that induces AC in the secondary coil • voltage ratio = ratio of turns in each coil

  7. D. Transformer • Step-up Transformer • increases the voltage • more turns • power plants • Step-down Transformer • decreases the voltage • fewer turns • household appliances (hairdryers, etc.)

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