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Transcript
Ch. 22 - Magnetism
III. Producing Electric Current
(p.633-639)
 Electromagnetic Induction
 Electric Generator
 DC & AC
 Transformer
A. Electromagnetic Induction
 Electromagnetic Induction
 producing a current by moving a wire through a
magnetic field
 some microphones
work just like minispeakers in reverse
Coil
 sound waves cause
coil to move  current
Dynamic Microphone
B. Electric Generator
 Electric Generator
 mechanical energy  electrical energy
 armature is
rotated between
magnet poles
 magnetic field
induces a
current in the
wire coil
GENERATOR
MOTOR
B. Electric Generator
 Hydroelectric Dam
 PE of lake water is
converted to KE
 mechanical KE
turns the generator
shaft which creates
electrical energy
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
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
D. Transformer
 Step-up Transformer
 increases the voltage
 more turns
 power plants
 Step-down Transformer
 decreases the voltage
 fewer turns
 household appliances
(hairdryers, etc.)