Keeping the T and E in sTEmLight Up with Technology: LED Circuit ApplicationDanielly OrozcoCurriculum Coordinator

June 18, 2014

Keeping the T and E in sTEm

Keeping the T and E in sTEm1Made in Florida (MIF) Lesson PlanLight Up with Technology: LED Circuit ApplicationEducational resources: MIF Lesson plansLesson plan: Light Up with TechnologyTeacher lesson plan reviewMaterials & costTheory review & technical termsSafety Hands on exerciseActivity debrief Lesson evaluation survey

Keeping the T and E in sTEm

Keeping the T and E in sTEm2Educational resources Made in Florida (MIF) Lesson PlansMIF is part of FLATEs educational resources

Aligning curriculum to STEM- keeping 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

Keeping the T and E in sTEm3Educational resources Made in Florida (MIF) Lesson Plans

Keeping the T and E in sTEm

Keeping the T and E in sTEm4Light Up with Technology: Teacher lesson plan review

Keeping the T and E in sTEm

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.

Keeping the T and E in sTEm5Light Up with Technology: Teacher lesson plan review, Cont.

Keeping the T and E in sTEm

Keeping the T and E in sTEm6Light Up with Technology: Teacher lesson plan review, Cont.

Keeping the T and E in sTEm

Keeping the T and E in sTEm7Light Up with Technology Materials & Cost

Keeping the T and E in sTEm

ItemCost*LEDs (yellow, red, green color), PK 2$1.99LEDs red high bright color$2.49LEDs 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$9.49Electrical 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$2.99Coin battery cell holder-CR2032$5.99Wire nut connector, PK 100, min. 2#22 - Max. 3#16 gauge$5.48Miscellaneous ItemsCost*Ruler or measurement tape, scissors, black and red color pencils$1.50Decorative ItemsFoam sheets PK 10 sheets, 8 in x 12 in$1.00Stickers, PK 10$1.00Ribbon with metallic border-optional, min. 21/2 in. width$1.00Color plastic sheets, PK 8$1.00TOOLSWire Stripper/cutter$4.99Needle-nose pliers$4.99Digital multi-meter$9.00Approximate 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 sTEm8Light Up with Technology: Theory review & Technical terms

Keeping the T and E in sTEm

Anode is the terminal or electrode in an electrical system through which electrical current enters or flows into the system.

Current into Anode (+)Cathode (-)Cathode is the terminal or electrode through which electrical current exitsthe system.Anode and CathodeIn electrical systems are defined by the flow of current. Polarity may be either positively or negatively charged it depends on how the device operates. Anode is positive in a device that consumes power or electrical current enters the system. Example: recharging battery

The cathode is the negative terminal, from which current exits the device. Anode is negative in a device that provides power or electrical current leaves the system.Example: discharging batteryIn this case the cathode is the positive terminal Keeping the T and E in sTEm9Light Up with Technology: Theory review & Technical terms

Keeping the T and E in sTEm

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 sTEm10Light Up with Technology: Theory review & Technical terms

Keeping the T and E in sTEm

American wire gauge (AWG) is a measurement of diameter of a wireSolid wire:4 AWG(proper), #4or 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 gaugeConductorDiameter InchesOOOO0.46OOO0.4096OO0.364800.324910.289320.257630.2294200.032210.0285220.0254ASTMStandard 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 sTEm11

Keeping the T and E in sTEm

Electrical conductivity is denoted by the symbol and has SIunits 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.

Diodeis 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 sTEm12LED a Light-Emitting Diode

Keeping the T and E in sTEm

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 (+). When an LED's anode lead has a voltage that is more positive than its cathode lead current flows.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 sTEm13LED a light-emitting diode

Keeping the T and E in sTEm

AdvantagesLower energy consumption (over incandescent light sources) Longer lifetime, smaller sizeRadiates very little heat in the form ofinfrared that can cause damage to sensitive objects or fabricDisadvantagesRelatively expensive (initial price)LED performance largely depends on the ambient temperature of the operating environment. Applications Aviation lighting, automotive headlamps, advertising andtraffic signals, video displays and camera flashes.

Light Up with Technology: Theory review & Technical terms

Keeping the T and E in sTEm14LED a light-emitting diodeThe following table shows the available colors with voltage drop

Keeping the T and E in sTEm

Light Up with Technology: Teacher Reference Material, Cont.

ColorWavelengthVoltage drop (V)Red610