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Squishy Circuits
learn to build electrical circuits
Created by Elisabeth Anderson, Updated March 2019
Introduction
Squishy Circuits Guidelines
● Wash your hands before using dough
● Table surface should be clean (Miss Anderson has washed them)
● Dyed doughs are conductive / non dyed doughs are insulating
● Use only the 4 pack of AA batteries with Squishy Circuits (6 volts)
● Keep materials off the carpet
● Gently push doughs together but do not mix the colors together
● Return doughs to their plastic containers when done
● Share & Get along
Goals
Understand or create the following
● a closed circuit; open circuit; short circuit
● battery types and their voltage
● use a volt meter
● the anatomy of an LED & types
○ single color: purple, red, blue, green, yellow, orange
○ bipolar: red/green, green/blue, red/blue
○ color changing (rainbow)
● what it takes to burn up an LED/motor/fan/buzzer= too much voltage
● polarity
● electrode
● electrons
● electrical flow
● resistance
● conductivity
● insulating
Introduction
Anodes
Circuit Basics
http://en.wikipedia.org/wiki/Light-emitting_diode
Anatomy of LEDs
http://squishycircuitsstore.com/LEDs.html
How do LEDs work? Click the vids.
The Electrical Circuit
Types of Circuits
Electricity takes the path
of least resistance, least
resistance can be a
shortcut/short cicuit.
Voltage, Current and
Resistance
Voltage = Current x Resistance
Click here to reach the electricity games.
Squishy Battery
About Series and Parallel circuits
Make these Electrical Circuits
by making a Squishy battery.
The LED burns brightly. The LEDs burn less brightly. The LED burns dimly.
Series Circuit & Parallel Circuits
Squishy Battery Points
Each electrode has a different affinity (likeness) for
electrons
Electrodes = galvanized nail + copper wire
Each dough slab = cell
Length of dough battery determines volts
It won’t power much more than an LED
Red LED works best
Squishy Animal
More Squishy Things
Motors
LED versus a Bulb
RGB LED controller
Squishy Speaker
Squishy Battery with Arduino &
Breadboard
Additional Instructional
Resources
More about LEDs
http://dangerousprototypes.com/docs/Basic_Light_Emitting_Diode_guide
Image by S-kei: CC BY-SA
“A light emitting diode consists of two pieces
of semiconductor. One P-type with positively
charged “holes”, and one N-type with
negatively charged electrons.
When the P side is connected to power, and
N to ground, (forward biased P->N
direction) current flows through the diode.
The electrons and holes combine,
neutralizing each other. This releases energy
in the form of light, pretty blue (or
whatever) LEDness.
The energy is released at a constant wave-
length which dictates the color of an LED.”
Types of Batteries 4.5 Volts
Types of Batteries AA
Types of Batteries AAA
Types of Batteries 9-volt
Types of Batteries Lantern
Types of Batteries D

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Squishy Circuits for Kids