Notes

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SPI 080712.1 Electromagnetic Induction
Notes
Science
Tennessee SPI Objective Recognize that
electricity can be produced using a magnet and
wire coil.
Instructions 1) First click on "View" from the
top-menu bar. 2) Then click on "Slide Show" from
the drop-down menu. 3) Then use the right-arrow
button on your keyboard to advance through this
presentation.
Check for Understanding Create a diagram to
explain the relationship between electricity and
magnetism.
Essential Question(s) How is electricity produced
with a magnet and a coil of wire?
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SPI 080712.1 Electromagnetic Induction
Science
Notes
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
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SPI 080712.1 Electromagnetic Induction
Science
Notes
Here is a diagram of electromagnetic induction

• The magnet has to move through the coil

Orthe coil has to move through the magnet
Here is the magnet
Here is the solenoid (coil of wire)
Here is a Galvanometer (measures electric
current and direction of the current)
The bar magnet is pushed back and forth through
the solenoid
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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
SPI 080712.1 Electromagnetic Induction
Science
Notes
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)
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SPI 080712.1 Electromagnetic Induction
Science
Notes
Note in this diagram, 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
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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
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SPI 080712.1 Electromagnetic Induction
Science
Notes
Two Ways to Increase the Electrical Current
(1) Move the magnet faster
(2) Add more coils of wire
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SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is an example of a question you might see on
a quiz or test.
11
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is an example of a question you might see on
a quiz or test.
12
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is an example of a question you might see on
a quiz or test.
13
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is an example of a question you might see on
a quiz or test.
14
SPI 080712.1 Electromagnetic Induction
Science
Questions
Here is an example of a question you might see on
a quiz or test.
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SPI 080712.1 Electromagnetic Induction
Science
Notes
Brainpop Video
View the Brainpop video titled "Electricity Link
Brainpop Website User name ----- (ask your
teacher for the user name) Password ----- (ask
your teacher for the user name) Task 01 Write
down five things that catch your attention as
your watch this video Task 02 Complete the
Brainpop quiz