Electricity and magnetism
Electricity:
It is a flow of electrons.
Electricity
and magnetism are related.
When electric
current flows through a wire, a magnetic field is produced.
Drawing:
MAGNETS
What is a bar
magnet?
A bar magnet
always has a magnetic field. They have two poles:
-North pole
(+)
-South pole (-)
ELECTROMAGNETS
Microphones, speakers and high speed trains (maglev-magnetic
levitation train) use electromagnets. Page 30 and 31.
