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7/1/16
1
Lights On! Solar Power, Copper Tape Circuitry, LEDs, Sensors, Microcontrollers
Samantha Lindgren Jana SebesEk
OFFICE FOR MATHEMATICS, SCIENCE, AND TECHNOLOGY EDUCATION UNIVERSITY OF ILLINOIS AT URBANA-‐CHAMPAIGN
credc.mste.illinois.edu
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The Cyber Resilient Energy Delivery ConsorEum (CREDC) EducaEon team conEnues the work of the TCIPG EducaEon project. The team develops interacEve lessons and acEviEes designed to link researchers, educators, consumers, and students. The materials illustrate challenges, trade-‐offs, and decisions required for secure and economical power delivery. The project seeks to involve families learning together while creaEng interest in STEM disciplines and careers. The project website offers a series of hands-‐on and virtual energy related acEviEes and challenges.
Jana SebesEk, University of Illinois [email protected] Samantha Lindgren, University of Illinois [email protected]
Curriculum guides, templates, and sources for materials are available at credc.mste.illinois.edu/resources
This material is based upon work supported by the Department of Energy under Award Number DE-‐OE0000780.
credc.mste.illinois.edu
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Observe What are you seeing?
Use the coin cell ba.ery to experiment with various LED colors and combina;ons.
• What are the colors of the LEDs? • Which colors are brightest? • How many LEDs can light at once?
Connect an LED by touching the anode (longer leg) to the posiEve(+) side of the badery and the other leg (the cathode) to the back (-‐) side.
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Which colors can be wired into the same circuit? Does the order mader?
What causes the power in your neighborhood to go out? SomeEmes a tree or a squirrel creates an easy route to the ground and causes a short circuit in the power system. Create a short circuit on your breadboard.
• How many red LEDs can light at one Eme? • How many blue LEDs? • How many white LEDs? • What happens when you mix colors? • Which combinaEons of LEDs cause some bulbs not to light? Which LEDs stay on and which go out?
• What happens when the RGB LED is in a circuit with each of the other colors?
Inves;gate possible circuit combina;ons
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Circuits with LEDs
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First Copper Tape Circuit
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Copper Tape Switch and Ba.ery
Extend the copper tape from the other side of the break and fold sEcky side to sEcky side so that the shiny side of the tape touches the top of the badery.
Place the badery on the copper tape just before a break.
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Copper Tape Circuits
Trace the path of the circuit with copper tape. Fold the tape at the corners and only leave breaks in the tape for the badery and LED. Both legs of the LED and both sides of the badery need to be part of the conducEng path.
Series and Parallel Circuits
• Trace each of these circuits with copper tape. Insert LEDs and a badery into each.
• How many LEDs can you light?
• What colors of LEDs can you light?
• What happens if you put two baderies into a circuit?
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Series and Parallel Circuits?
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Will all four LEDs light?
Predict:
ALL? THREE? TWO? ONE? NONE?
What actually happens? Add two more LEDs so all six light.
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Think Why is this?
What causes the power in your neighborhood to go out? SomeEmes a tree or a squirrel creates an easy route to the ground and causes a short circuit to the power system. Create a short circuit. Make one bulb light and then add a shorEng wire by touching one end to the posiEve side of the badery and the other to the negaEve side. Why does the light go off?
Where is the current going? Why is it called a short circuit?
Power Outage!!
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More About Short Circuits
Whenever one path in a circuit has less resistance, a short circuit occurs. How can this explain why LEDs of one color cause others to not light?
• Make several bulbs light and then add a shorEng wire. Do all of the bulbs do the same thing?
• Touch one end of the wire to the posiEve side of the badery and touch the cathode of an LED with the other end.
• Does it mader which bulb you touch or where the wire is placed?
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Turn on the Lights!