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ELECTRICAL ENGINEERING 52 ÕÌÌiÀyÞ -`iÀ}® Activity Type Intermediate Grade Level Grades 5 – 8 Grouping: Pairs Activity Time 1 hour 10 minutes Preparation Time £ ÕÀ Ìi wÀÃÌ Ìi Ìi >VÌÛÌÞ Ã V«iÌi` Ì prepare materials (see Advance Preparation), 15 minutes for gathering materials Career Connections • Electrical engineer • Toy designer Source Adapted from the ÞLÕ} «ÀiVÌ `iÛi«i` LÞ i ÕÀ«ÞÆ used with permission. For information on making Blinkybugs or to order the book The Blinkybug Kit] ÛÃÌ www.blinkybug.com. +P VJKU CEVKXKV[ MKFU FGXGNQR VJGKT EKTEWKVDWKNFKPI UMKNNU CU VJG[ ETGCVG C DWVVGTƃ[ VJCV JCU .'& G[GU CPF YKTG CPVGPPCG 6JG CEVKXKV[ KU C HWP YC[ HQT MKFU VQ FGXGNQR EQPƂFGPEG KP YQTMKPI YKVJ GNGEVTQPKE GSWKROGPV CPF CNUQ TGKPHQTEGU YJCV VJG[ JCXG NGCTPGF CDQWV VJG RQNCTKV[ QH DCVVGTKGU CPF .'&U Framing Question *QY ECP EKTEWKVU DG WUGF CU RCTV QH VQ[U QT FGEQTCVKQPU! Learning Objectives #U C TGUWNV QH VJKU CEVKXKV[ MKFU YKNN DG CDNG VQ • Construct a working circuit • Understand the effect that polarity has on circuit design Key Terms LED Polarity Materials Per class: • 6JTGG QT HQWT .'& DWVVGTƃKGU VQ RCUU CTQWPF see Advance Preparation • One or two rolls of foil tape • Foam sheets in a variety of colors GPQWIJ HQT GXGT[ MKF VQ JCXG CV NGCUV QPG UJGGV • 2KRG ENGCPGTU KP C XCTKGV[ QH EQNQTU GPQWIJ HQT GXGT[ MKF VQ JCXG CV NGCUV VYQ RKGEGU Per pair: ? • Hot glue gun • Hot glue stick • 0GGFNGPQUG RNKGTU • 5ETCR ECTFDQCTF VQ RNCEG WPFGTPGCVJ INWG IWPU Tip: If you prefer, you can set up hot glue stations around the room.
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ELECTRICAL ENGINEERING52
Activity TypeIntermediate
Grade LevelGrades 5 – 8
Grouping:Pairs
Activity Time1 hour 10 minutes
Preparation Time
prepare materials (see Advance Preparation), 15 minutes for gathering materials
Career Connections• Electrical engineer • Toy designer
SourceAdapted from the
used with permission. For information on making Blinkybugs or to order the book The Blinkybug Kit
www.blinkybug.com.
Framing Question
Learning Objectives
• Construct a working circuit
• Understand the effect that polarity has on circuit design
Key TermsLED
Polarity
MaterialsPer class:
• see Advance Preparation
• One or two rolls of foil tape
• Foam sheets in a variety of colors
•
Per pair:
?
• Hot glue gun
• Hot glue stick
•
•
Tip: If you prefer, you can set up hot glue stations around the room.
53ELECTRICAL ENGINEERING
Per individual:
Advance Preparation•
•
•
Possible answers:
•
Possible answers:with foil tape.
•
Possible answers:
Look at 3-volt batteries.
• What does the plus symbol on top of the battery mean?
Possible answers:
•
Possible answers:
it looks so different from other kinds of batteries. If kids are struggling, you can show them an AA battery, note the positive and negative terminals, and ask kids to identify the corresponding negative and positive terminals on the coin cell battery.
• •
• •
• • handout
ELECTRICAL ENGINEERING54
3. Discuss polarity.
• -
Possible answers:
on the role of electrical engineers
Describe the activity and distribute materials.
around the group and answer questions. Make sure that partners are supporting one another.
complete the activity as a group, going through each step together. Whichever way you conduct the activity, keep in mind the following hints:
• Make sure kids understand that foil tape cannot wrap around the battery from one side to the other, as this will create a short circuit and the LEDs will not light up.
• can save frustration later in the process.
• Be available to help kids put their completed battery/LED circuit into the battery holder
As described on the handout, kids should remove the metal contacts from the holder before attempting this step, as these pieces can be sharp.
3.
glue.
! Safety Note:
55ELECTRICAL ENGINEERING
• problems, and how did your partner help?
•
Possible answers:
•
Journal Ideas
•
Extensions •
whether the circuit is in series or parallel, and then have them draw a circuit diagram. The circuit diagram should make clear to kids that the circuit is parallel, as there are two paths (a path through
Snap Circuits Challenges for
•
take a new set of materials home and do it with their parents. This can also give kids practice with
•
Career Connections
Resources
ELECTRICAL ENGINEERING56
Science Background
charge, a force that repels particles with the same charge and
Electrifying Electrons
Online Resources
Videos About LEDsTitle Link
Pop Siren: How LEDs Work
57HANDOUT: LED BUTTERFLY
on the role of an electrical engineer
Troubleshooting Tips•
•
•
Assembly Instructions
1.
2. Take the two negative LED legs and cross them over one another. Using pliers, twist the two legs together.
HANDOUT: LED BUTTERFLY58
Assembly Instructions
3. Bend
4. Take the two negative LED legs and cross them over one another. Using pliers, twist the two legs together.
5. About 1/3 of an inch from the point of the
upward at a 90° angle.
59HANDOUT: LED BUTTERFLY
Assembly Instructions
6. Turn the battery over to the negative side,
tape.
Do not let the tape wrap around to the positive side of the battery!
7. Turn the battery back over to the positive side. Bend the positive LED legs in a 90°
8. positive side of the battery with a small
away from the LEDs. Press the tape down Do not let the tape wrap around to the
negative side of the battery!
HANDOUT: LED BUTTERFLY60
Assembly Instructions
9. Using the pliers, take the ends of the positive LED legs and curl them into a loop. Then bend the loops so they are parallel to your work surface.
10. Insert the ends of the guitar string into the loops made by the LED legs. Make sure the
push the LED legs forward from the battery
should light up.
11. out what needs to change:
•
•
•
•
61HANDOUT: LED BUTTERFLY
Assembly Instructions
12. Once you are sure your circuit works, take the battery holder and use the pliers to pull off any pieces of metal sticking out of it. Ask your instructor for help if you have any trouble. Be care-ful—the pieces are sharp!
13. Push the battery into the battery case, making sure that the LEDs are sticking out of one of the cut out sides of the holder. This may be hard to do. Ask your instructor for help if you are having trouble.
14. gun to glue them onto the battery case.
