electromagnetism and generating electricity
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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 Moving electric
charge creates a magnetic field. Magnetic field
lines form circles around wire
Right hand rule
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.
Solenoid makes an electromagnet
Electricity and Magnetism Strength of electromagnet depends on
1. Current 2. Number of loops3. Type of core
Electromagnetic Devices
Many devices use electromagnets: 1. Galvanometer – device that detects
and measures electric current2. Electric motor – uses an
electromagnet to turn an axle.3. Loudspeaker – uses changing
current to move a magnet back and force to produce sound waves
Electric Motor
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
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
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
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)
Transformer
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.GalvanometerElectric motor Loudspeaker
Generator Step-Up Transformer
Step-DownTransformer
Electromagnetism FoldableGalvanometer: 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)