DIY Circuit Switch for Kids

Have you ever wondered how a simple switch works to control the flow of electricity? In this hands-on STEM activity, build a circuit switch and see how electrons travel through a circuit! You can even add it to a DIY flashlight!

Circuit Switch for Kids

Switches are everywhere, from turning on your flashlight to powering a lamp holder. They play a key role in controlling the flow of electricity in a circuit. This DIY project teaches kids how switches work using simple components like a paperclip, electrical wire, and a power source. This activity is an engaging way to explore electrical engineering and better understand conductivity.

💡Find more electrical engineering activities [here]!

Grade Level: Recommended for grades 3–5, with younger children participating under supervision.

Supplies

• Small piece of cardboard (2″ x 3″)
• 2 metal fasteners (paper brads)
• 1 paper clip
• Copper wire or electrical wire
• Alligator clip wires or electrical tape
• Battery holder and battery pack
• Light bulb and light bulb holder

How to Make a Circuit Switch

Step 1: Cut a piece of cardboard into a rectangle about 2″ x 3″. This will be the base for your simple switch.

Step 2: Use scissors to poke two small holes, about 1 inch apart, near one end of the cardboard. Push a metal fastener through each hole and secure it by flattening the prongs on the back.

Step 3: Attach a paperclip to one fastener, creating a movable “U shape.” This paperclip acts as the switch.

Step 4: Rotate the paperclip to touch both fasteners to complete the circuit.

Step 5: Connect one end of each wire to the fasteners using alligator clips or electrical tape. Attach the other ends of the wires to a battery holder and a light bulb holder.

Step 6: Test your circuit! Rotate the paperclip to touch both fasteners, closing the circuit. The light bulb should light up! Move the paperclip away to “open” the circuit and turn the light bulb off.

The Science Behind A Circuit Switch

This activity demonstrates the flow of electricity through a circuit. When the paperclip touches both fasteners, it acts as a good conductor of electricity. It completes the circuit and allows electrons to flow from the power source (battery) through the wires and into the light bulb. Opening the circuit interrupts this flow, turning off the light bulb.

💡Take it further and test it with our DIY flashlight.

The components of a circuit include:

1. Power Source (e.g., battery pack): Provides the energy to move electrons.
2. Conductive Pathway (e.g., copper wire): Allows electrons to travel.
3. Load (e.g., light bulb): Converts electrical energy into light or heat.
4. Switch (e.g., paperclip): Controls the flow of electricity.

Understanding circuits is foundational in STEM. Circuits power everything from your browser on a computer to the best YouTube experience on a tablet. Switches are crucial for safely and efficiently managing electrical systems, whether part of a simple circuit board or a more complex system.