Download Electromagnetism

ELECTROMAGNETISM
ELECTROMAGNET
Electric
current produces a
magnetic field
Electromagnetism
is the
relationship between electricity
and magnetism
CHARACTERISTICS OF MAGNETIC FIELD
PRODUCED BY A CURRENT
Can
be turned off
Can
have its direction changed
Can
have its strength changed
SOLENOID
A
coil of wire with a current
running through it
HOW ARE A SOLENOID AND A BAR
MAGNET ALIKE AND DIFFERENT?
 Alike
because both have north and
south poles.
 Different
because the poles of the
solenoid will change directions with
the direction of the current.
ELECTROMAGNET
Solenoid
with a metallic and
magnetic core (iron)
Can
be turned on or off
INCREASING THE STRENGTH OF AN
ELECTROMAGNET
 Increase
 Add
current in solenoid
more loops of wire to solenoid
 Wind
the coils of solenoid closer
together
 Use
core
a stronger magnetic metal for
WHAT ARE SOME USES OF
ELECTROMAGNETS?
 The
uses of electromagnets include:
 Recording information on DVDs
and iPods
 Computer hard drives
 Credit cards
 Lifting heavy objects/ car lifter at
the junkyard
COMMON ELECTROMAGNETS
COMMON ELECTROMAGNETS
MAGNETIC INDUCTION


Occurs when a magnetic field is created that
competes with the Earth’s own magnetic field.
Ex: Putting a compass near an electromagnet will
cause the compass needle to change directions