Transcript “T” and “E” in sTEm

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Light Up with
Technology:
LED Circuit Application
Made in Florida (MIF) Lesson Plan
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“Light Up with Technology:
LED Circuit Application”
• Educational resources: MIF Lesson plans
• Lesson plan: Light Up with Technology
• Teacher lesson plan review
• Materials & cost
• Theory review & technical terms
• Safety
• Hands on exercise
• Activity debrief
• Lesson evaluation survey
Educational resources
Made in Florida (MIF)
Lesson Plans
MIF is part of FLATE’s
educational resources
• Aligning curriculum to STEM- keep
focus on the Technology &
Engineering.
• Curriculum is easy adaptable for
lower or higher school levels.
• Classroom materials designed to
provide real world scenarios based on
manufacturing companies throughout
Florida.
Educational resources
Made in Florida (MIF)
Lesson Plans
Light Up with Technology:
Teacher lesson plan review
Nature of Experience
To understand & apply the
theory behind basic
electronics.
Students are challenged to
engineer and manufacture a
light-emitting diode (LED)
using a simple circuit.
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Light Up with Technology: +
Teacher lesson plan review, Cont.
Light Up with Technology: +
Teacher lesson plan review, Cont.
Light Up with Technology
Materials & Cost
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Approximate cost per project $ 5.00
Calculations based on 24 students (2- 4 students per group)
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Item
*LEDs (yellow, red, green color), PK 2
LEDs red high bright color
LEDs blue color, PK 2
*Mini metallic alligators clips, PK 12
*Electrical tape-multicolor, PK 5- 3/4" x
30 foot, 600 V
*Electrical wire/hookup wire (22 Gaugesolid), 100 foot black rolls, 300 V
Electrical wire/hookup wire (22 Gaugestranded), PK 3-25 foot color rolls,
stranded, 300 V
*Batteries (Lithium Button cell R2032),
PK 4, 3 V
Cost
$1.99
$2.49
$2.49
$3.49
Coin battery cell holder-CR2032
Wire nut connector, PK 100, min. 2#22 Max. 3#16 gauge
$5.99
$8.49
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$9.49
$7.44
$2.99
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Miscellaneous Items
*Ruler or measurement tape, scissors,
black and red color pencils
Decorative Items
Foam sheets PK 10 sheets, 8 in x 12 in
Stickers, PK 10
Ribbon with metallic border-optional,
min. 21/2 in. width
Color plastic sheets, PK 8
TOOLS
Wire Stripper/cutter
Needle-nose pliers
Digital multi-meter
$5.48
*Minimum recommended material needed it for the lesson
Cost
$1.50
$1.00
$1.00
$1.00
$1.00
$4.99
$4.99
$9.00
Light Up with Technology:
Theory review & Technical terms
Anode is the negative terminal of a
voltaic cell or battery.
Cathode is the positively charged
electrode of an electrical device, such
as a battery, that supplies current.
Conductance Electrical conductivity is
the measure of the amount of
electrical current a material can carry.
American wire gauge (AWG) is a
measurement of diameter of a wire.
Light Up with Technology:
Theory review & Technical terms
American wire gauge (AWG) is a
measurement of diameter of a wire
Solid wire:
4 AWG (proper), #4 or No 4
Stranded wires:
• Overall AWG size,
• Number of strands,
• AWG size of a strand.
Example: 22 AWG 7/30 stranded:
22 AWG wire made from seven
strands of 30 AWG wire.
AWG gauge
Conductor
Diameter Inches
OOOO
OOO
OO
0
1
2
3
20
21
22
0.46
0.4096
0.3648
0.3249
0.2893
0.2576
0.2294
0.032
0.0285
0.0254
ASTM Standard B 258-02, Standard specs. for standard nominal diameters and
cross-sectional areas of AWG sizes of solid round wires used as electrical
conductors, ASTM International, 2002
Light Up with Technology:
Theory review & Technical terms
Electrical conductivity is denoted by the symbol σ and has SI units of
siemens per meter (S/m).
Conductive thread is a fabric which can conduct electricity.
Conductive threat or textiles can be made with metal strands woven
into the construction of the textile.
Diode is a two- terminal electronics component with asymmetric
conductance; it has low (ideally zero) resistance to current in one
direction
Electric Circuit is a path in which electrons from a voltage or current
source flow.
LED ?
Light Up with Technology:
Theory review & Technical terms
LED a Light-Emitting Diode
• Diode that glows when electricity
passes through it.
• Current to pass in one direction only.
The cathode is normally indicated by
a flat side on the casing.
• The anode is normally indicated by a
slightly longer leg.
• The current required to power an
LED is usually around 20 mA.
• How LEDs work-video
Light Up with Technology:
Theory review & Technical terms
LED a light-emitting diode
Advantages
• Lower energy consumption (over
incandescent light sources)
• Longer lifetime,
• smaller size
• Radiates very little heat in the form
of infrared that can cause damage
to sensitive objects or fabric
Disadvantages
• Relatively expensive (initial
price)
• LED performance largely
depends on the ambient
temperature of the operating
environment.
Applications
Aviation lighting, automotive headlamps,
advertising and traffic signals, video displays
and camera flashes.
Light Up with Technology:
Teacher Reference Material, Cont.
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LED a light-emitting diode
The following table shows the available colors with voltage drop
Color
Red
Orange
Yellow
Green
Blue
Violet
White
Voltage drop (ΔV)
1.63 < ΔV < 2.03
2.03 < ΔV < 2.10
2.10 < ΔV < 2.18
1.9 < ΔV < 4.0
2.48 < ΔV < 3.7
2.76 < ΔV < 4.0
ΔV = 3.5
LED types by Color, Brightness, and Chemistry. wikipedia.com.
Retrieved on May 10, 2014.
Light Up with Technology:
Standardized symbols
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Symbol for regular light bulb
Symbol for LED
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Symbol for a wire
Symbol for a Battery
Symbol for a Closed Switch
Symbol for an Open Switch
Light Up with Technology:
Stools & applications
Make sure to use the proper tool(s)
for the right job!
Wire stripper/cutter is a hand-held device
used to strip the electrical insulation form
electric wires
Needle-nose pliers also known as long-nose
pliers, pinch-nose pliers or snipe-nose pliers,
are both cutting and holding plier used to
bend, re-position and cut wire.
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Light Up with Technology:
Hands on Exercise
Design Problem
Imagine that you are a technician or an engineer
working with LEDnovation and your next
assignment is to test different types of Light
Emitting Diodes to determine the best LED to use
in a hospital’s recuperation room but you do not
want the lighting on the LED equipment to be too
bright at night when the patient is trying to sleep.