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Teaching notes, project walkthroughs, and hands-on electronics guides from Gary and the Mr Circuit team.

2 posts Updated Jun 29, 2026
Multimeter checking a broken connection on a simple classroom breadboard circuit
continuity testHow to Find an Open Circuit

Learn how to find an open circuit with a safe continuity and voltage-check routine teachers and beginners can use on breadboards, switches,...

Jun 29, 2026· 6 min read
Beginner classroom circuit showing the difference between a connected path and a broken path
beginner electronicsOpen Circuit vs Closed Circuit

Learn the difference between an open circuit and a closed circuit with simple examples, classroom language, and a quick troubleshooting checklist.

Jun 18, 2026· 4 min read