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Understanding Electromagnetic Induction and Electric Generators

This section explores the principles of electromagnetic induction and its applications in producing electric current through electric generators. It covers the conversion of mechanical energy into electrical energy via rotating armatures within magnetic fields and discusses the functions of Direct Current (DC) and Alternating Current (AC). Additionally, the section highlights the workings of transformers, including step-up and step-down models used in power plants and household appliances. Understanding these concepts is crucial for grasping the fundamentals of electricity generation and distribution.

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Understanding Electromagnetic Induction and Electric Generators

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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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