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Electromagnetism and Generating Electricity

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Electricity and magnetism are different aspects of a single force: electromagnetism Electricity = result of charged particles Magnetism = result of moving electrons ... – PowerPoint PPT presentation

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Title: Electromagnetism and Generating Electricity


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

6
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

7
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

8
Generating Electricity
  • Moving a magnet into and out of a coil of wire
    causes charges in a wire to move.
  • Became Faradays Law
  • Obeys conservation of energy

9
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

10
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)

11
Electromagntism 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
12
Electromagntism 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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