DIY Flashlight for Kids

Explore Electricity with a DIY Flashlight

Electricity powers our lives, from the lamp by your bed to the batteries in your favorite toy. But how does it all work? It begins with a basic electrical circuit, where components like a light bulb, battery, and switch create a closed circuit. This activity makes it easy to understand the formation of electric current—and have fun while doing it!

Grade Level: Recommended for Grades 3-6 (adult supervision required for wiring and cutting).

💡🛑 Learn more about how to make a simple circuit [here]. Then advance to parallel circuit and series circuit projects! Check out more circuit projects below.

Supplies Needed:

• Cardboard tube (like a toilet paper roll)
• Small LED light bulb
• Battery holder (or battery box) with 2 AA or AAA batteries
• Electrical tape or non-conductive tape
• Wires (with copper bell wire or alligator clips)
• Paper fasteners (brass fasteners or brads)
• Paper clip (to act as a switch)
• Aluminum foil
• Scissors or craft knife
• Tape or glue
• Optional: A strip of copper tape for better conductivity
• Decorative materials (optional)

How to Make Your DIY Flashlight

🛑 Adult supervision and assistance are recommended when exploring circuits and electricity.

Prepare the Tube:

• Cut a piece of card stock to cover one end of the cardboard tube. Secure it with tape.
• Make a small hole in the center of the card stock and insert the LED light bulb, ensuring it fits snugly.

Create the Circuit:

• Punch two holes near the open end of the tube. Insert brass fasteners into these holes.
• Connect one wire from the positive side of the battery holder to one fastener and another to the other.

Add a Switch:

• Straighten a paper clip and attach one end to a fastener. Rotate it so it can touch the second fastener to act as a switch, completing the circuit.

Below is an example of a circuit and switch set up. You will need to create this switch on the outside of the cardboard tube as shown below.

Test and Decorate:

• Insert the batteries into the holder. When the paper clip touches both fasteners, the LED light bulb should glow!
• Cover the tube with aluminum foil, construction paper, or decorate it as desired.

DIY Flashlight STEM Information

Your DIY flashlight demonstrates the formation of electric current through a basic electrical circuit. Here’s how it works:

• Battery as Power Source: The positive side of the battery pushes free electrons through the circuit, creating electrical energy.
• Switch Functionality: The paper clip acts as a manual switch, allowing you to create a closed circuit (when the light is on) or break the circuit (when the light is off).
• LED Light Bulb: The electrical energy from the battery powers the LED, which converts it into light energy.
• Conductors: Materials like the wires, copper tape, and fasteners allow the electric current to flow smoothly.

Who Invented the Flashlight?

This activity connects to the work of inventors like Conrad Hubert, who helped create the first flashlight in the 1890s. He worked with David Misell, who designed and patented an early portable lamp in 1899. Hubert improved the design and made the flashlight we recognize today.

D-cell batteries powered the first flashlights, used a bulb for light, and had a simple switch to turn them on and off—just like the ones we use now.

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