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,...
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Teaching notes, project walkthroughs, and hands-on electronics guides from Gary and the Mr Circuit team.
6 posts
Updated Jun 29, 2026
breadboardHow to Find a Short Circuit
Learn how to find a short circuit in a simple classroom circuit using a safe power-off routine, resistance checks, and targeted breadboard...
circuit safetyHow to Measure LED Current Safely
Learn how to measure LED current safely with a multimeter by placing the meter in series, using the correct jack, and protecting...
digital multimeterHow to Measure Resistance With a Multimeter
Learn how to measure resistance with a multimeter using a simple power-off routine teachers and beginners can use for resistors and classroom...
battery voltageHow to Measure Battery Voltage in a Classroom Circuit
Learn how to measure battery voltage in a classroom circuit with a digital multimeter using a safe low-voltage routine teachers can use...
digital multimeterHow to Teach Students to Use a Digital Multimeter
Teach students to use a digital multimeter with a safe beginner routine for voltage, resistance, and continuity in STEM class.