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Section 3-2
Electricity, Magnetism
and Motion
Objectives
 N.3.2.1. Explain how electrical energy
can be transformed into mechanical
energy.
 N.3.2.2. Describe how a Galvanometer
works.
 N.3.2.3. Describe what an electric motor
does.
Conservation Of Energy
 Do you remember the Conservation of
Matter Law? What does it say?
 Matter is not created or destroyed, only
changed.
 So what do you think the Conservation of
Energy might say?
 Energy is not created or destroyed, only
changed.
Electrical Energy And Motion
Electrical To Motion
 When a wire carrying a
current is placed in a
magnetic field, the
electrical energy is
converted to
mechanical energy.
Motion To Electrical
 When a wire is moved
through a magnetic
field, and electric
current is induced and
mechanical energy is
converted to electrical
energy.
Creating Current
 When a wire moves
through a magnetic
field it induces a
current in the wire.
This is call Electrical
Induction.
Mechanical energy is
changed into
electrical energy.
Space Station Tether Experiment
 The Shuttle
Columbia pulled a
conducting tether
through Earth’s
magnetic field to
create electricity.
Creating Current
 A typical dam uses
gravity to pull water
through a turbine
which turns a
generator and
produces electricity.
Creating Motion
 Electricity in a motor
can be converted into
rotational mechanical
motion. This device is
called a motor.
It Works In Both Directions
Generator
 What does a
generator convert?
 A generator converts
mechanical energy to
electrical energy.
Motor
 What does a motor
convert?
 A motor convert
electrical energy to
mechanical energy.
Galvanometer
Electric Motors
 An electric
motor
transforms
electrical energy
into mechanical
energy. Objective N.3.2.3.
Commutator
Look Closely
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