Download Introductory Video Script Template

Introductory Video Script Template
Lesson
Objective
Course
Semester
Unit
Lesson
SCIENCE 7
A
6
4
Students will explain and demonstrate how electric current produces
magnetic forces and how moving magnets produce electric current.
CLIP A
Visual
Audio
<Image>
Electricity and magnetism are tightly coupled. In
fact, you can think of them as two sides of the
same coin.
http://www.morguefile.com/archive/di
splay/57379
<Image>
http://www.morguefile.com/archive/di
splay/838937
Scientists have observed that a changing
electric field creates a magnetic field.
<Image Display bulb, then bring in
the 2nd image>
If you have a circuit and send AC current
(alternating current) through with electrons
moving back and forth, a changing electric
current will be created.
A magnetic field will be produced…
http://pixabay.com/en/light-bulbcurrent-light-glow-503881/
http://commons.wikimedia.org/wiki/Fi
le:DipolMagnet.svg
<Image>
http://pixabay.com/en/dead-end-
Similarly, a change in a magnetic field will
create an electric field.
blind-alley-stop-arrows-43421/
<Image>
Electromagnetic waves travel quite well.
For instance the sun provides us with light and
heat that travel through space to reach us on
the planet Earth.
http://pixabay.com/en/bamboodamyang-sunshine-364112/
QUESTION A
Both electric and magnetic fields are interdependent, this means:
A. they do not rely on one another
B. magnetic fields are independent
C. neither has an effect on the other
D. one field requires the other or one field produces the other
Correct answer is D, proceed to CLIP B
Incorrect answer (all other), proceed to CLIP E
CLIP B
Visual
Audio
<Image>
When a charged particle such as an electron is
in motion, invisible magnetic lines of force will
rotate around it.
http://www.morguefile.com/archive/di
splay/943980
<Image>
Since an electrical current moving through a
wire consists of electrons in motion—a
magnetic field surrounds the wire.
http://pixabay.com/en/ball-abstractpattern-lines-443853/
<Image Zoom in on North, then
slowly move downward to South>
The direction of a magnetic field has lines of
force that move from north to south.
http://pixabay.com/en/compass-mapdirection-north-south-32477/
<Image Add to image an arrow
pointing left to right, with a (+) on the
left and a (-) on the right>
Although electrons have a negative charge and
move toward the positive terminal on a wire,
electric current moves from (+) to (-).
http://www.morguefile.com/archive/di
splay/934708
QUESTION B
The lines of force from a magnetic field run in which direction?
A. east to west
B. west to east
C. north to south
D. south to north
Correct answer is C, proceed to CLIP C
Incorrect answer (all other), proceed to CLIP F
CLIP C
Visual
<Image Zoom in on the center of
image, place red circles around the
N and S on image>
Audio
Now let’s look at magnetic force:
The magnetic fields of a bar magnet can be
revealed by placing iron filings on paper, and a
bar magnet underneath.
This shows how opposites attract...
http://commons.wikimedia.org/wiki/Fi
le:Magnet0873.png
<Image Place the text “ATTRACT” in This photo shows a closer look at the magnetic
the center>
field of two bar magnets with unlike poles close
together.
http://commons.wikimedia.org/wiki/Fi
le:Magnetic_field_of_bar_magnets_a
ttracting.png
<Image Zoom in on center of image,
Place the text: “REPEL” in the
center>
Next, a photo of the magnetic field of two bar
magnets with like poles close together.
You can see how they repel one another.
http://commons.wikimedia.org/wiki/Fi
le:Magnetic_field_of_bar_magnets_r
epelling.png
<Image Zoom in on the open ends,
label one “NORTH” and the other
“SOUTH”>
This horseshoe magnet shows similar force on
both sides of the magnet.
Although magnetic fields themselves are
invisible, these images with iron filings give you
a representation of their force.
http://commons.wikimedia.org/wiki/Fi
le:Magnetic_field_of_horseshoe_ma
gnet.png
QUESTION C
In order for 2 magnets to attract one another,
A. their opposite poles must meet
B. their same poles must meet
C. they can be placed in any direction
D. none of the above
Correct answer is A, proceed to CLIP D
Incorrect answer (all other), proceed to CLIP G
CLIP D
Visual
<Image>
Audio
Around a wire carrying current, the magnetic
field lines form circles.
http://pixabay.com/en/hose-couplingpower-cable-strange-206004/
<Image Display images together,
then transition text underneath:
“COUNTERCLOCKWISE”
“CLOCKWISE”>
How do you know which direction the magnetic
field is going? The direction of the magnetic
field coincides with the flow of current in the
wire.
Counterclockwise or…
Clockwise
http://pixabay.com/en/cycle-recyclerotation-160072/
<Image Zoom in on the red arrow
and the text: Electric current>
The following is a way to remember this:
The right hand rule is used to predict the
direction of a magnetic field.
With your thumb pointing upward, this depicts
the direction of the current flow.
http://commons.wikimedia.org/wiki/Fi
le:V-1_right_hand_thumb_rule.gif
<Image Zoom in on the fingertips
and the blue arrows with the text:
Magnetic field>
With your hand in the same position, your
fingertips are pointing in the direction that the
magnetic field will travel. It is a
counterclockwise motion.
What happens to the direction when you point
your thumb down?
http://commons.wikimedia.org/wiki/Fi
le:V-1_right_hand_thumb_rule.gif
QUESTION D
__________________________________ determines the direction of the magnetic
field.
A. The size of the wire
B. The amount of volts passing through a wire
C. The direction of flow of current through a wire
D. The type of insulation on a wire
Correct answer is C, SUCCESS alert
Incorrect answer (all other), proceed to CLIP H
CLIP E
Visual
<Image>
Audio
Magnets are surrounded by a magnetic field.
http://commons.wikimedia.org/wiki/Fi
le:Earth's_magnetic_field_pole.svg
<Image Create a circle with an “e”
and “-“ inside of it and transition it
into and out of the red magnetic
field>
http://commons.wikimedia.org/wiki/Fi
le:Earth's_magnetic_field_pole.svg
If an electron were to move through that field, it
would experience force and its path would
curve.
These moving charges now create a magnetic
field.
<Image>
Electric current is a bunch of moving electrons.
If you place a wire carrying a current in a
magnetic field, there will be force on the wire,
and the wire will move.
http://commons.wikimedia.org/wiki/Fi
le:Simple_electromagnet.gif
<Image>
Technically speaking, by arranging all of this in
the correct fashion, you could make a motor.
http://pixabay.com/en/vehiclechrome-technology-193213/
QUESTION E
When a wire made of a conducting material passes through a magnetic field,
A. the neutrons become active
B. an electric current is created in the wire
C. nothing will happen
D. the magnetic field will disappear
Correct answer is B, proceed to CLIP B
Incorrect answer (all other), proceed to CLIP F
CLIP F
Visual
Audio
<Image>
Electric motors use both electricity and magnets
to create motion.
http://www.morguefile.com/archive/di
splay/42014
<Image>
The incoming electricity provides power and
generates magnetic fields which convert power
into motion.
http://www.morguefile.com/archive/di
splay/600464
<Image>
A motor uses electricity to generate motion.
The motors in these fans rotate the blades…
http://www.morguefile.com/archive/di
splay/53465
<Image>
A generator uses motion to make electricity.
This generator provides electricity to homes.
http://www.morguefile.com/archive/di
splay/28983
QUESTION F
A generator is responsible for the production of which of the following
A. Motion
B. Magnets
C. Motors
D. Electricity
Correct answer is D, proceed to CLIP C
Incorrect answer (all other), INTERVENTION alert, proceed to CLIP B
CLIP G
Visual
<Image>
Audio
An electromagnet is made by wrapping a wire
coil around an iron core.
http://commons.wikimedia.org/wiki/Fi
le:Solenoid-1.png
<Image>
A single wire wrapped into a cylindrical wire coil
is called a solenoid.
The magnetic field inside of it is stronger than
the field in a single loop.
http://commons.wikimedia.org/wiki/Fi
le:Simple_electromagnet2.gif
<Image Show images side by side>
The strength of the magnetic field can be
increased by adding more turns of wire to the
solenoid, or by increasing the current.
http://commons.wikimedia.org/wiki/Fi
le:EnOcean_ECO200_white.jpg
http://commons.wikimedia.org/wiki/Fi
le:Luftspulen.JPG
<Image Display speaker image, then
the gauge image>
Besides an electric motor, an electromagnet
has a variety of applications.
Some examples are:
Music speakers
Gas tank gauges on a dashboard
http://pixabay.com/en/speakersaudio-sound-music-playback-
180989/
http://pixabay.com/en/fuel-petrolgas-gauge-empty-full-2741/
QUESTION G
The strength of a magnetic field can be increased by which of the following?
A. adding more turns to the wire
B. decreasing the number of wire turns
C. it cannot be increased
D. decreasing the current strength
Correct answer is A, proceed to CLIP D
Incorrect answer (all other), proceed to CLIP F
CLIP H
Visual
Audio
<Image>
Electric energy is carried by a current, which
is a flow of electrons.
http://pixabay.com/en/street-lightsjunction-night-neon-600472/
<Image transition in one at a time,
powerlines, lights, then phone>
The transfer of electrons from one place to
another will power your lights, phones, and
many other things that you use daily.
http://pixabay.com/en/current-energyenvironment-206928/
http://pixabay.com/en/ceiling-lamplamp-chandelier-bulbs-335975/
http://pixabay.com/en/smartphoneiphone-apple-inc-phone-593319/
<Image>
This flowing current always produces its own
magnetic field.
http://pixabay.com/en/magnetismelectromagnetic-field-148997/
<Image Underneath images place text: Magnetism and electric currents are closely
“MAGNETIC FIELD”
linked in a closed loop, therefore
“ELECTRON FLOW”>
Electrical currents create magnetic fields…
Magnetic fields produce electron flow....
http://pixabay.com/en/magnetic-fieldlines-magnetic-field-454906/
http://pixabay.com/en/abstract-patternlines-wave-106424/
QUESTION H
When electrons move, they create a
A. proton
B. circuit
C. chemical reaction
D. magnetic field
Correct answer is D, SUCCESS alert
Incorrect answer (all other), proceed to CLIP G