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+ Light Up with Technology: LED Circuit Application 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 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. + Light Up with Technology: + Teacher lesson plan review, Cont. Light Up with Technology: + Teacher lesson plan review, Cont. Light Up with Technology Materials & Cost + Approximate cost per project $ 5.00 Calculations based on 24 students (2- 4 students per group) • • • • • • • • • • 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 • • • • • $9.49 $7.44 $2.99 • • • • • 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. + 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 + Symbol for regular light bulb Symbol for LED + _ 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. + 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.