Transcript Week 4 Lessons

Week 4 Lessons
What will you learn?
1c. Students know electric currents produce
magnetic fields and know how to build a simple
electromagnet.
1f. Students know that magnets have two poles
(north and south) and that like poles repel each
other while unlike poles attract each other.
1d. Students know the role of electromagnets in the
construction of electric motors, electric
generators, and simple devices, such as doorbells
and earphones.
Let’s talk about magnetism…
 Magnetism is a pulling or
pushing force caused by
the motion of electric
charges (remember
electrons?).
 Magnetism and
electricity are related as
one can cause the other
and vice versa.
Magnets….
• Are objects that attract
iron, steel, and some
other metals.
• All magnets display the
property of magnetism.
• Magnets can be created
using electricity.
Magnetic Fields
• Magnets create
lines of force
(pushing and
pulling lines)
around them.
• This lines of
force combine
to form a
magnetic field.
Do you see the magnet? Can you
tell if this is a strong magnet?
Magnetic Poles
o A magnet has two poles- called the
North and South pole.
o Like poles attract and unlike poles
repel.
Magnetic
fields are
strongest
at the
poles!
The Earth behaves
like a magnet
because of its iron
core.
The Earth’s North
and South poles are
like the poles of a
magnet.
Compasses always
orient to Earth’s
North Pole.
Now it’s time for a…