Notes

1
SPI 080712.1 Electromagnetic Induction
Notes
Science
Tennessee SPI Objective Recognize that
electricity can be produced using a magnet and
wire coil.
Instructions for Students 1) Make sure you view
this presentation in slideshow mode. 2) You can
find instructions about how to do this by doing a
Google search or by searching YouTube. 3) After
you have it in slideshow mode, press the
right-arrow keyboard button to advance through
the presentation. 4) If you need help, please
communicate with your teacher.
Essential Question(s) 1) How is electricity
produced with a magnet and a coil of wire? 2) How
do I make a simple generator?
Check for Understanding A) Create a diagram that
demonstrates the connection between electricity
and magnetism. B) Use magnets and wire to build a
simple generator.
2

Key Ideas and Terms

• Magnets and a coil of wire can induce (create)
  electricity

• This process is called electromagnetic induction

• Note another name for electricity is electrical
  current

• Note another name for a coil of wire is a
  solenoid

Bar Magnet
Coil of Wire (Solenoid)
3

Electromagnetic induction

• The magnet has to move through the coil

or the coil has to move through the magnet
Here is the magnet
Galvanometer
Here is the solenoid (coil of wire)
Here is a Galvanometer (measures electric
current and direction of the current)
Solenoid
The bar magnet is pushed back and forth through
the solenoid
Magnet
4
How It Works

All magnets have an invisible magnetic force
field.
The bar magnet is pushed back and forth through
the solenoid
The magnetic force field pushes the electrons
from atom to atom in the wire creating electrical
current.
5

Look at the two generators shown below
Generators convert mechanical energy into
electrical energy

• Both diagrams are showing electromagnetic
  induction

Note in picture 01 the wire coil is stationary
and the magnet is moving back and forth
Note in picture 02 the magnet is stationary and
the wire coil is rotating
(It works either way)
6
SPI 080712.1 Electromagnetic Induction
Science
Notes
Note the magnet is stationary and the wire coil
is rotating.
It also works if the wire is stationary and the
magnet is moving
Magnet
Magnet
Wire Coil
7
F.Y.I.-Electromagnetic Induction

is how most electricity is generated around the
world.
These power plants all use magnets and coils of
wire to make electricity
8

F.Y.I.-Electromagnetic Induction
is how most electricity is generated in cars,
trains, boats, planes
Each of these machines has a generator inside
that creates electricity
Consists of a magnet rotating through a coil of
wire
9

Two Ways to Increase the Electrical Current
(1) Move the magnet faster
(2) Add more coils of wire
10
SPI 080712.1 Electromagnetic Induction
Science
Notes
Brainpop Video

• View the video titled "Electromagnetic Induction
• Link Brainpop Website
• Duration 2 min 25 sec
• User name ----- (ask your teacher for the user
  name)
• Password ----- (ask your teacher for the
  password)
• Task 01 Write down five things that catch your
  attention as
• you watch this video.
• Task 02 Complete the Brainpop quiz.

11
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is a question you might see on a quiz or
test.
12
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is a question you might see on a quiz or
test.
13
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is a question you might see on a quiz or
test.
14
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is a question you might see on a quiz or
test.
15
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is a question you might see on a quiz or
test.