This document discusses electromagnetic induction and how motors and generators work. It defines key terms like electromagnet, electric field, magnetic field, induction. It explains that a motor converts electrical energy to mechanical energy using electromagnetic induction to create opposing electromagnetic fields on an armature that spin it. A generator converts mechanical energy to electrical energy by passing a coil through a magnetic field, inducing current. Both have coils and magnets but differ in the direction of energy flow and transformation. The document is titled "The Big Switch" because the same device can function as a motor or generator depending on the direction of energy and force.
4. Key Objectives:Key Objectives:
Explain the relationship
between a magnetic field
and electric current and how
they combine to form
electromagnetic induction
5. Key TermsKey Terms
Electric Motor
Electric Generator
Electromagnet
Electric Field
Magnetic Field
(Electromagnetic) Induction
9. Electric Field
The space around
an electrically
charged object
around which
another charged
object experiences
electric force
10. Magnetic Field
The area around
a magnet where
the magnetic
force can be felt
It runs from end
to end or from the
north pole to the
south pole of the
magnet.
12. Lab Break
Now you can partner up and go
to any station to begin your
observations
Remember to answer each
arrow before moving on
Remember to read and follow
all lab directions.
13. LAB BREAK
Begin work on part 2
Read and follow each step of the lab
Remember to write responses as you
go.
Complete all of part 2 with your partner
You have 20 minutes
23. Essential Learnings
Inside the generator
–electromagnetic induction
occurs as a copper coil
passes through a magnetic
field, creating electric
current
24. Essential Learnings
Both motors and generators
have the same basic parts
but their operations are
reverse
25. Essential Learnings
Internal components of
motors and generators
– A coil of copper wire wrapped
around a soft iron core
(armature)
– A set of permanent magnets that
create a magnetic field
26. Essential Learnings
The differences between
them is the direction of the
energy flow and the energy
transformation order
27.
28. Why “The Big Switch” ?
The term “switch” refers to the
changeover from motor to
generator of what is basically the
same device.
As the direction of the energy
transformation “switches” the
device’s purpose “switches”
30. A Windmill (Wind Turbine)
Windmills generators transform
mechanical energy to electrical
energy.
Done by creating an electric field
inside the generator (electromagnet
induction) when a copper coil passes
through a magnetic field