Keeping the “T” and “E” in sTEm

Light Up with Technology:

LED Circuit Application

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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

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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.

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Keeping the “T” and “E” in sTEm

Light Up with Technology: Teacher lesson plan review, Cont.

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Keeping the “T” and “E” in sTEm

Light Up with Technology: Teacher lesson plan review, Cont.

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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)

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*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.

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Keeping the “T” and “E” in sTEm

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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

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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.