How AnnMarie Thomas Teaches Hands-On Science With Squishy Circuits

TL;DR

Children can learn electronics hands-on by building squishy circuits from conductive salt play-dough and resistant sugar dough. The homemade conductive dough has half the resistance of commercial Play-Doh, while the sugar version is 150 times more resistant than the salt dough. With a battery pack, LEDs, motors, and even microprocessors, children can explore short circuits, electrical load, and parallel and series circuits. Read on to see how each material and project works.

Transcript

I'm a huge believer in hands-on education. But you have to have the right tools. If I'm going to teach my daughter about electronics, I'm not going to give her a soldering iron. And similarly, she finds prototyping boards really frustrating for her little hands. So my wonderful student Sam and I decided to look at the most tangible thing we could t... Read More

Key Insights

• 🔋 Homemade Play-Doh recipes can conduct electricity and be used to build circuits, providing a tangible and accessible tool for hands-on education in electronics.
• 💡 Regular Play-Doh from the store has been used by high school physics teachers to demonstrate electrical conduction.
• ⚡ Homemade play-dough has half the resistance of commercial Play-Doh, making it more conducive to conducting electricity.
• 🔌 Sugar play-dough is 150 times more resistant to electric current than salt play-dough, providing different levels of conductivity for circuit building.
• 🚀 By combining the different types of play-dough, circuits can be created, allowing even young children to become circuit designers.
• 🎶 More complex circuits can be built using play-dough, including parallel and series circuits, and even incorporating microprocessors for sound output.
• 🏠 The kitchen can be transformed into an electrical engineering lab by using homemade play-dough recipes and basic electronic components.
• 🌍 Homemade play-dough circuits have gained popularity around the world, with parents, researchers, and curriculum developers utilizing this hands-on educational tool.

Questions & Answers

Q: How can homemade Play-Doh be used to teach electronics?

Children can shape conductive salt play-dough into circuit paths and use sugar dough as a barrier to electrical current. Connecting the dough to a two-lead battery pack lets them experiment with LEDs, motors, short circuits, electrical load, and parallel and series circuits.

Q: Why are salt dough and sugar dough used together in squishy circuits?

The salty play-dough conducts electricity, while the sugar dough resists current and acts like a wall between conductive sections. Combining them makes it possible to build connected sculptures without creating an unwanted short circuit.

Q: How conductive is homemade salt play-dough compared with commercial Play-Doh?

The homemade conductive play-dough has half the resistance of commercial Play-Doh. Regular store-bought Play-Doh also conducts electricity and has been used by high school physics teachers for demonstrations.

Q: How resistant is sugar dough compared with salt dough?

The sugar dough is 150 times more resistant to electric current than the salt dough. This makes it useful for separating conductive pieces while allowing the sculpture’s dough sections to touch.

Q: How do you light an LED with a squishy circuit?

Connect the salt dough to a two-lead battery pack and place the LED across separated conductive sections. If the salt-dough sections are pushed together, the current travels through the dough instead of the LED and the light turns off; separating them restores the light.

Q: What projects can children make with squishy circuits?

Children can light LEDs, add a motor to make a sculpture’s tail spin, and build the more complicated “sushi circuit.” They can also add microprocessors, use the circuit as an input, and create squishy sound music.

Q: How can squishy circuits demonstrate electrical load?

Children can plug multiple lights into a circuit and then add a motor. The lights dim, providing a visible way to discuss electrical load.

Q: What circuit concepts can children explore with play-dough?

Play-dough circuits can demonstrate conductivity, resistance, short circuits, electrical load, and parallel and series circuits. The materials turn a home kitchen into a hands-on electrical engineering lab where young children can design circuits themselves.

Summary & Key Takeaways

• The speaker and a student experimented with different homemade Play-Doh recipes to create circuits that conduct electricity.

• Regular Play-Doh bought from stores, as well as homemade Play-Doh with salt, conduct electricity, while homemade Play-Doh with sugar is resistant to electric current.

• By combining the homemade Play-Doh with different conductive properties, children can easily build their own circuits, learn about parallel and series circuits, and even create more complex projects like squishy sound music.