Download Notes-Electromagnetic Induction

Notes
SPI 0807:12.1
Electromagnetic Induction
Science
Tennessee SPI Objective:
Recognize that electricity can be produced using a magnet
and wire coil.
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.
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Key Ideas and Terms
Magnets and a coil of wire can induce (create) electricity

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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
Simple Electrical Generator
Coil of Wire
(Solenoid)
Bar Magnet
Electromagnetic induction

The magnet has to move through the coil
… or the coil has to move through the magnet
Simple Electrical Generator
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
How It Works
All magnets have an invisible
magnetic force field.
Simple Electrical Generator
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.
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)
Picture 01
Picture 02
Notes
SPI 0807:12.1
Electromagnetic Induction
Science
Note: the magnet is stationary and the wire coil is rotating.
It also works if the wire is stationary and the magnet is moving
Simple Electrical Generator
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
Nuclear Power Plant
Wind Turbines
Coal Power Plant
Hydroelectric Dam
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
Electrical Generator
(Alternator)
Consists of a
magnet rotating
through a
coil of wire
Two Ways to Increase the Electrical Current
(1) Move the magnet faster
(2) Add more coils of wire
Notes
SPI 0807:12.1
Electromagnetic Induction
Science
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.
Questions
SPI 0807:12.1
Electromagnetic Induction
Science
Here is a question you might see on a quiz or test.
Questions
SPI 0807:12.1
Electromagnetic Induction
Science
Here is a question you might see on a quiz or test.
Questions
SPI 0807:12.1
Electromagnetic Induction
Science
Here is a question you might see on a quiz or test.
SPI 0807:12.1
Science
Questions
Electromagnetic Induction
Here is a question you might see on a quiz or test.
Questions
SPI 0807:12.1
Electromagnetic Induction
Science
Here is a question you might see on a quiz or test.