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.

1. The Big Switch

2. Key Objectives:Key Objectives:
Demonstrate an
understanding of magnetic
fields
Construct an electromagnet
and explain how it works

3. Key Objectives:Key Objectives:
Demonstrate an
understanding of motors and
generators and their uses

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

6. Electric Motor
A device that
converts/
transforms
electrical energy
into mechanical
energy

7. Electric Generator
A device that
converts/transforms
mechanical energy
into electrical
energy

8. Electromagnet
A coil wrapped
around a soft iron
core and that acts
as a magnet
when an electric
current runs
through the coil

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.

11. Electromagnetic Induction
The process in
which a magnet
passes through a
copper coil
creating an
electrical field
– The generation of
electricity

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

14. Page 23
 Question 2

15. Page 25
 Question 2

16. Essential Learnings
A current-carrying wire is
surrounded by an
electromagnetic field.

17. Essential Learnings
An electromagnet is
produced when current
passes through a wire
coiled around an iron or
steel rod

18. Essential Learnings
Forces of repulsion and
attraction cause motion
when magnetic fields
interact.

19. Essential Learnings
 Motors transform electrical
energy into mechanical
energy.

20. Essential Learnings
 Inside the motor
–Current creates two
opposing electromagnets
on the armature (the
copper coil and iron part
that spins)

21. Essential Learnings
Inside the motor
–The electromagnets on the
armature repel the
stationary magnets in
position around the
armature

22. Essential Learnings
 Generators transform
mechanical energy into
electrical energy.

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

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”

29. From One to the Other!!!

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

31. Wind Turbine