light up with technology: led circuit application
TRANSCRIPT
Keeping the “T” and “E” in sTEm
Light Up with Technology:
LED Circuit Application
+
Keeping the “T” and “E” in sTEm
Made in Florida (MIF) Lesson Plan“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
+
Keeping the “T” and “E” in sTEm
Educational resources Made in Florida (MIF)
Lesson PlansMIF 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.
Keeping the “T” and “E” in sTEm
Educational resources Made in Florida (MIF)
Lesson Plans
Keeping the “T” and “E” in sTEm
Light Up with Technology: Teacher lesson plan review
Nature of ExperienceTo understand & apply the theory behind basic electronics. Students are challenged to engineer and manufacture a light-emitting diode (LED) using a simple circuit.
+
Keeping the “T” and “E” in sTEm
Light Up with Technology: Teacher lesson plan review, Cont.
+
Keeping the “T” and “E” in sTEm
Light Up with Technology: Teacher lesson plan review, Cont.
+
Keeping the “T” and “E” in sTEm
Light Up with Technology Materials & Cost
Item Cost• *LEDs (yellow, red, green color), PK 2 $1.99• LEDs red high bright color $2.49• LEDs blue color, PK 2 $2.49• *Mini metallic alligators clips, PK 12 $3.49• *Electrical tape-multicolor, PK 5- 3/4" x
30 foot, 600 V $8.49• *Electrical wire/hookup wire (22 Gauge-
solid), 100 foot black rolls, 300 V $9.49• Electrical wire/hookup wire (22 Gauge-
stranded), PK 3-25 foot color rolls, stranded, 300 V $7.44
• *Batteries (Lithium Button cell R2032), PK 4, 3 V $2.99
• Coin battery cell holder-CR2032 $5.99• Wire nut connector, PK 100, min. 2#22 -
Max. 3#16 gauge $5.48
Miscellaneous Items Cost• *Ruler or measurement tape, scissors,
black and red color pencils $1.50• Decorative Items • Foam sheets PK 10 sheets, 8 in x 12 in $1.00• Stickers, PK 10 $1.00• Ribbon with metallic border-optional,
min. 21/2 in. width $1.00• Color plastic sheets, PK 8 $1.00• TOOLS • Wire Stripper/cutter $4.99• Needle-nose pliers $4.99• Digital multi-meter $9.00
Approximate cost per project $ 5.00 Calculations based on 24 students (2- 4 students per group)
+
*Minimum recommended material needed it for the lesson
Keeping the “T” and “E” in sTEm
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.
Keeping the “T” and “E” in sTEm
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 ConductorDiameter Inches
OOOO 0.46OOO 0.4096OO 0.36480 0.32491 0.28932 0.25763 0.2294
20 0.03221 0.028522 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
Keeping the “T” and “E” in sTEm
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
Keeping the “T” and “E” in sTEm
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
Keeping the “T” and “E” in sTEm
LED a light-emitting diodeAdvantages• 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: Theory review & Technical terms
Keeping the “T” and “E” in sTEm
LED a light-emitting diodeThe following table shows the available colors with voltage drop
Light Up with Technology: Teacher Reference Material, Cont.
Color Voltage drop (ΔV)Red 1.63 < ΔV < 2.03Orange 2.03 < ΔV < 2.10Yellow 2.10 < ΔV < 2.18Green 1.9 < ΔV < 4.0Blue 2.48 < ΔV < 3.7Violet 2.76 < ΔV < 4.0White ΔV = 3.5
LED types by Color, Brightness, and Chemistry. wikipedia.com. Retrieved on May 10, 2014.
+
Keeping the “T” and “E” in sTEm
+
_+
Symbol for a wire
Symbol for a Closed Switch
Symbol for LED
Light Up with Technology: Standardized symbols
Symbol for regular light bulb
Symbol for a Battery
Symbol for an Open Switch
Keeping the “T” and “E” in sTEm
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.
Keeping the “T” and “E” in sTEm
Design Problem
Light Up with Technology: Hands on Exercise
+
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.