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Electromagnetism and Generating Electricity

Electromagnetism and Generating Electricity. Electricity and Magnetism. Electricity and magnetism are different aspects of a single force: electromagnetism Electricity = result of charged particles Magnetism = result of moving electrons in an atom. Electricity and Magnetism.

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Electromagnetism and Generating Electricity

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  1. Electromagnetism and Generating Electricity

  2. Electricity and Magnetism • Electricity and magnetism are different aspects of a single force: electromagnetism • Electricity = result of charged particles • Magnetism = result of moving electrons in an atom

  3. Electricity and Magnetism • Moving electric charge creates a magnetic field. • Magnetic field lines form circles around wire • Right hand rule

  4. Electricity and Magnetism • Solenoid – a coil of wire with an electric current (produces magnetic field). • By putting a solenoid around an magnetic metal, you create an electromagnet.

  5. Solenoid makes an electromagnet

  6. Electricity and Magnetism • Strength of electromagnet depends on • Current • Number of loops • Type of core

  7. Electromagnetic Devices • Many devices use electromagnets: • Galvanometer – device that detects and measures electric current • Electric motor – uses an electromagnet to turn an axle. • Loudspeaker – uses changing current to move a magnet back and force to produce sound waves

  8. Electric Motor

  9. Generating Electricity • Moving a magnet into and out of a coil of wire causes charges in a wire to move. • Electromagnetic induction – process of creating a current by changing a magnetic field

  10. Generating Electricity • Moving a magnet into and out of a coil of wire causes charges in a wire to move. • Became Faraday’s Law • Obeys conservation of energy

  11. Generating Electricity • Generators are the opposite of motors: convert mechanical energy into electrical energy. • Have wire loops that are rotated between two magnets • Can be either AC or DC

  12. Generating Electricity • Transformer – device that increases or decreases the voltage of AC. • Consists of two coils of wire wrapped around opposite sides of a closed iron loop • One side has more loops • More loops = greater voltage • Used to transfer electricity (power plant to homes)

  13. Transformer

  14. Electromagnetism Foldable • Fold the paper as instructed • Label each section as follows: • For each section, draw the correct figure from the book, including labels and the caption. Galvanometer Electric motor Loudspeaker Generator Step-Up Transformer Step-Down Transformer

  15. Electromagnetism Foldable • Galvanometer: Fig 5 on p. 630 (Fig 10 p. 638) • Electric motor: Fig 6 on p. 631 (Fig 11 p. 639) • Loudspeaker: Speaker pic on p. 635 (none) • Generator: Fig 3 on p. 634 (Fig 14 p. 643) • Step-Up Transformer: Fig 7A on p. 638 (Fig 16B p. 645) • Step-Down Transformer: Fig 7B on p. 638 (Fig 16A p. 645)

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