Classroom Circuits: Hands-On Electronics for Kids

Building simple circuits teaches problem-solving the same way model rockets do — step by step, with real failures that lead to real understanding. Here's a starter project I use with 4th–6th graders.

Materials (per group of 3)

• 1× 9V battery + snap connector
• 1× 220Ω resistor
• 1× LED (any color)
• Breadboard & jumper wires

Steps

1. Connect battery positive to one resistor leg.
2. Other resistor leg to LED anode (long leg).
3. LED cathode to battery negative.
4. Watch it light — if not, flip the LED.

Safety note: Always check polarity before connecting power. No soldering needed for this first build.

Extension Challenge

Add a second LED in parallel. Discuss why brightness changes. Tie it to real systems like the power distribution in a Mars habitat.

Links to further experiments and my short film on the same topic.