Download Introductory Video Script Template

Introductory Video Script Template
Lesson
Objective
Course
Semester
Unit
Lesson
SCIENCE 7
A
6
2
Students will track the flow of electrons through a conductor and a simple
circuit.
CLIP A
Visual
<Image show image #1, then
transition in #2>
http://www.pd4pic.com/black-boxdirection-square-arrows-followflow.html
Audio
An electrical circuit is formed when a path is
created for electrons to move continuously.
This current is often called a ‘flow”, similar to
water running smoothly through a pipe.
http://www.pd4pic.com/water-dripsflow.html
<Image Create and image with a line The force that motivates electrons to flow in a
segment with end points marked A circuit is referred to as voltage; free electrons
and B, then place the text:
are moving from one atom to another.
”VOLTAGE” on the line in and
between the 2 points>
Voltage is a measure of potential energy that is
present between two points.
<Image>
Free electrons move through conductors with
some friction.
Resistance is how tightly a conductor is holding
the electrons.
http://pixabay.com/en/electricalcircuits-resistors-40454/
<Image Display the text:
“VOLTAGE
+ RESISTANCE
=CURRENT IN A CIRCUIT”>
The amount of current in a circuit depends on
the amount of voltage pushing the electrons and
the amount of resistance opposing the flow of
electrons.
<Image>
Thinner and shorter wires have more resistance
than longer and wider ones because the current
has a tighter space in which to move through.
http://www.morguefile.com/archive/di
splay/138245
QUESTION A
You have a short, small extension cord plugged in to the wall,
A. it has less resistance than a longer one
B. it has more resistance than a longer one
C. it has less resistance than a wider one
D. it has the same amount of resistance as a long one
Correct answer is B, proceed to CLIP B
Incorrect answer (all other), proceed to CLIP E
CLIP B
Visual
<Image>
http://pixabay.com/en/electricalcircuits-resistors-40454/
Audio
A circuit is a path between two or more points
along which an electrical current is carried.
<Image Display battery image with
arrows moving from bottom to top,
then show flashlight>
Electrical charges can only move through a
circuit if it is complete, because when they are
pushed from one end, they need to be replaced
at the other.
This is why your flashlight shines brightly.
http://www.pd4pic.com/-battery-cellelectricity-energy-negativepositive.html
http://pixabay.com/en/light-torchlamp-electric-159858/
<Image>
Amperes “amps” are the unit of measurement
for a current.
Fuses in cars or homes are rated by how many
amps of current they can safely carry.
These are ten amp breakers
http://commons.wikimedia.org/wiki/Fi
le:Circuit_breaker_10amps.jpg
<Image Zoom in on a breaker,
Display breaker image first, then
show fire image>
If too much current is in a circuit, a breaker will
flip and cause an incomplete circuit which
disrupts the flow of electricity.
If a breaker did not react to this, a fire could
occur due to overload.
http://www.morguefile.com/archive/di
splay/768447
http://www.pd4pic.com/paper-fireburnt-burn-burner.html
QUESTION B
If the path of the flow of electrons is interrupted, what will happen to the light in your
room?
A. It will no longer be lit
B. It will get dimmer
C. It will bet brighter
D. none of the above
Correct answer is A, proceed to CLIP C
Incorrect answer (all other), proceed to CLIP F
CLIP C
Visual
<Image>
http://www.morguefile.com/archive/di
splay/857775
Audio
A simple circuit consists of a power source,
such as a battery, wires as conductors and a
resistor like an appliance.
http://www.morguefile.com/archive/di
splay/48644
<Image “TWO TYPES OF
CIRCUITS:
SERIES and PARALLEL”>
<Image Create an image with the
battery and lights similar to the one
shown below >
Components of a circuit can be arranged in
either series or parallel circuitry.
In a series circuit, the current must pass
through one resistor to get to the next.
The voltage is divided between them, if one
goes out, they all go out.
http://commons.wikimedia.org/wiki/Fi
le:Battery.png
http://www.morguefile.com/archive/di
splay/227545
(NOT PUBLIC DOMAIN, use as
template)
<Image Create an image with the
battery and lights similar to the one
shown below, then show strand of
lights>
In a parallel circuit, each light (resistor) is
electrically connected to the source at the same
point; each gets the voltage at the same time.
If one goes out the others stay lit; this is how
Christmas lights are designed.
http://commons.wikimedia.org/wiki/Fi
le:Battery.png
http://www.morguefile.com/archive/di
splay/227545
(NOT PUBLIC DOMAIN, use as
template)
http://www.morguefile.com/archive/di
splay/742936
QUESTION C
In which type of circuitry, is each resistor connected to the source at the same point and
getting full voltage simultaneously?
A. Series
B. Perpendicular
C. Parallel
D. none of the above
Correct answer is C, proceed to CLIP D
Incorrect answer (all other), proceed to CLIP G
CLIP D
Visual
<Image>
Audio
Suppose that you were given a light bulb, a
piece of copper wire and a battery…
How could you successfully light the bulb?
http://www.morguefile.com/archive/di
splay/133415
<Image Display light on the left, then
sign on the right>
Think back to the requirements of an electric
circuit.
What is needed to illuminate this bulb,
http://www.pd4pic.com/light-bulbelectric-bulb-electric-lampelectricity.html
or this neon sign?
http://www.morguefile.com/archive/di
splay/916459
<Image bring in batteries from the
left and then bulb from the right
meeting in the center>
OK, you need a complete loop from the (+)
terminal to the (-) terminal, with both the battery
and the light bulb being part of the loop.
http://www.morguefile.com/archive/di
splay/214578
http://www.morguefile.com/archive/di
splay/187850
<Image-add in a drawn wire,
connecting the brass base to the (-)
terminal on battery>
To complete the flow of electrons in the circuit,
the base of the light bulb connects to the (+)
terminal and the wire extends from the ribbed
sides of the bulb base to the (-) terminal of the
cell.
http://www.morguefile.com/archive/di
splay/187848
http://www.pd4pic.com/cell-batteryamp-theresa-volt-volts-current.html
QUESTION D
Requirements of a complete circuit are
A. source of electron flow (battery, cell, outlet)
B. resistor (TV, light, freezer)
C. conductor (wire)
D. all of the above
Correct answer is D, SUCCESS alert
Incorrect answer (all other), proceed to CLIP H
CLIP E
Visual
Audio
<Image Display
Relative to electricity, substances are classified
into 2 main groups:
CONDUCTORS
MOBILITY
INSULATORS
MOBILITY>
<Image>
Conductors-high electron mobility
Insulators-low electron mobility
As a rule, most substances that are good
conductors of heat are also good conductors of
electricity.
Metals are strong conductors, like this skillet…
http://www.pd4pic.com/omelettemushroom-omelette-mushroomskillet-court.html
<Image Place circles (one at a time)
around the 3 electrons in the outer
shell >
Metals are good conductors because they have
at least one free electron per atom.
This is an atomic model of aluminum, with 3
free electrons in the outer shell.
http://www.pd4pic.com/modeldiagram-atom-iron-atomic-bohrnucleus.html
<Image>
In a good insulator, such as glass, all of the
electrons are tightly bound to atoms and there
are no free electrons.
http://www.pd4pic.com/glass-ballhand.html
QUESTION E
In ____________________ material, the outer electrons can easily come and go and
are called free electrons.
A. conductive
B. insulative
C. relative
D. supportive
Correct answer is A, proceed to CLIP B
Incorrect answer (all other), proceed to CLIP F
CLIP F
Visual
<Image>
Audio
Electrons flow through a circuit like water flows
through a hose.
http://www.morguefile.com/archive/di
splay/216181
<Image>
____________
FLOW
______________
If the electron flow is from left to right and there
is an interruption, like a broken wire, the flow of
electrons will stop.
NO FLOW
<Image>
In electrical terms, there was electrical
continuity when the wire was in one piece, but
now the flow is broken.
http://pixabay.com/en/chain-brokenlink-freedom-297842/
<Image>
Dynamic electricity or electric current is the
uniform motion of electrons through a
conductor.
These electrical wires are carrying electricity…
http://pixabay.com/en/wire-electricalcables-electricity-271991/
QUESTION F
For electrons to flow continuously through a conductor,
A. there must be an endpoint
B. there must be an insulator
C. there must be a complete, unbroken path for them to move into and out of
D. there must be an incomplete path
Correct answer is C, proceed to CLIP C
Incorrect answer (all other), INTERVENTION alert, proceed to CLIP B
CLIP G
Visual
Audio
<Image>
Certain types of materials will mysteriously
attract one another after being rubbed together.
Like a Latex balloon and hair…
http://www.pd4pic.com/girl-childtrampoline-blonde-staticelectricity.html
http://www.morguefile.com/archive/di
splay/583736
<Image Display door knob image
and place lightning bolts around the
knob>
Static electricity is a stationary electric charge
that is built up on a material.
Extra electrons are collected then discharged,
like when you touch a doorknob and get
shocked.
http://www.morguefile.com/archive/di
splay/187826
<Image>
This accumulation of negative charge happens
more in dry weather when these charges do not
dissipate easily—like the winter time when there
is less humidity.
http://www.morguefile.com/archive/di
splay/942381
<Image Display under hand image
“LOSES ELECTRONS”
Display under door knob: “GAINS
ELECTRONS”>
So when your hand touches the metal door
knob, your skin loses electrons (and
accumulates a positive charge) and the metal
gains electrons (and gains a negative charge).
http://www.morguefile.com/archive/di
splay/900057
http://www.morguefile.com/archive/di
splay/611244
QUESTION G
Static electricity is a result of
A. accumulation and discharge of electrons
B. accumulation and discharge of neutrons
C. accumulation and discharge of protons
D. all of the above
Correct answer is A, proceed to CLIP D
Incorrect answer (all other), proceed to CLIP F
CLIP H
Visual
<Image Place labels one at a time,
“BATTERY”
“WIRE”
“LIGHTBULB”>
Audio
This is a schematic image of a simple circuit.
It shows:
a power source-Battery
a conductor-Wire
a resistor-Lightbulb
http://commons.wikimedia.org/wiki/Fi
le:Eenvoudigestroomkringmet1lampj
eBrand.png
<Image Label “SERIES CIRCUIT”
UNDERNEATH, then
“SWITCH” and the “RESISITORS”>
This schematic shows a series circuit with a
switch and 2 resistors.
http://commons.wikimedia.org/wiki/C
ategory:Circuit_diagrams#mediaview
er/File:Eenvoudigestroomkringmet2l
ampjesen1schakelaar.png
<Image Label: “PARALLEL CIRCUIT This is a parallel circuit; notice the 3 parallel
underneath image, then Place circles wires flowing to the resistors.
around the 3 resistors (labeled R1,
R2 and R3)>
In this circuit, each resistor has its own branch,
which are multiple pathways for electron flow.
http://etamedia.com/Cyberschool/
Video_Assets/Images/Science/SC7
_SA_U6_L2_VS/Parrallel%20Circuit
s.jpg
(image has been replaced by above
link)
<Image Display atom image on the
left then bring in next image on the
right>
As electrons flow through resistance, a certain
amount of work is performed.
It can be in the form of heat, a magnetic field, or
motion—this “work” in electricity is called
power.
http://pixabay.com/en/atomicnucleus-nuclear-energy-467254/
http://pixabay.com/en/button-on-offpower-engage-energy-161555/
QUESTION H
Complete electric circuits have a variety of layouts, but all need the following for electron
flow:
A. resistor, insulator, volts
B. volts, watts, and conductor
C. conductor, resistor, and a power source
D. resistor, conductor, amps
Correct answer is C, SUCCESS alert
Incorrect answer (all other), proceed to CLIP G