Grouping: Pairs
Take-home: Working switch/conductivity circuit
Key ideas: Closed/open circuits, switches, conductors/insulators, loads, troubleshooting.
Start with: Use a simple tester to make a bulb/LED turn on through unexpected objects.
Success check: Students build a reliable switch circuit and test/classify several materials.
Try changing: Switch type; tested material; number of loads.
Preparation: Prepare known conductor/insulator samples and circuit challenge cards.
Lesson flow: Day 1: Build switch circuit → troubleshoot
Day 2: Convert circuit to conductivity tester → test/classify materials → design a useful switch
Safety and cleanup: Low-voltage only; teacher checks for short circuits; batteries disconnected during storage.
