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Electricity and
Magnetism
Electricity and Magnetism
how are they related?
 When
an electric
current flows
through a wire, a
magnetic field forms
around the wire.
The Right Hand Rule
 Use the Right hand rule to determine the direction of the current and
the magnetic field.
 Imagine your right hand curled around the wire, your thumb points in
the direction of the current and your fingers show the direction of the
magnetic field
What is an Electromagnet?
 When an electric current is passed through a coil of wire wrapped around a
metal core, a very strong magnetic field is produced. This is called an
electromagnet.
 The more coils wrapped around the core, the stronger the magnetic field that
is produced. This stronger magnetic field leads to a stronger current.
 An electromagnet is considered a temporary magnet.
What are Electric Motors?
 An electric motor is a
device which changes
electrical energy into
mechanical energy.
 A basic electric motor
has a power source, a
permanent magnet,
and an electromagnet
that can rotate.
How does an Electric Motor
work?
Electromagnetic Induction
 Electromagnetic induction is
when a loop of wire is moved
through a magnetic field. This
produces an electric current.
 A generator is used to convert
mechanical energy into electrical
energy by using electromagnetic
induction.
 An alternating current (AC) is
used in a generator.
Electromagnetic Induction vs.
Electric Motors
 The electromagnet in a generator is rotated by some outside source of
mechanical energy.
 Electric motors change electrical energy in to mechanical energy, and
generators turn mechanical energy into electrical energy.