Make the next concept click.
Free worked lessons and practical study guides for G3, G2, electrical, and other trade learners. Start with a question. Leave with a method.
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4 lessons · 4 articles
Try free practice →Learn it. Work it through.
Open access · no signupOhm’s law: see the circuit, solve the question
Work through a 24 V circuit, change voltage and resistance, and check your answer with units.
Unit conversions without the guessing
Use unit cancellation for length and power, and see why temperature conversions need an extra step.
Build a codebook lookup routine for G3 and G2 study
Practise finding a topic, checking its scope, reading table notes, and recording a useful reference.
Turn a wrong answer into your next study task
Diagnose a missed question, write a useful correction, and test whether you can repeat the reasoning.
From the CodeSafe article library
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Preparing for your Ontario G3 Gas Technician certification? Learn what makes G3 challenging, what you should study, common mistakes to avoid, and how to prepare more effectively.
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How to Become a Gas Technician in Ontario: G3,G2 & G1 Explained
Thinking about becoming a gas technician in Ontario? Learn how the G3, G2 and G1 certification levels work, what TSSA requires, and how to progress through each stage.
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Know where the lesson comes from.
These lessons are original CodeSafe learning notes. Calculation lessons link to reference material; study routines are labelled as CodeSafe methods. Each article displays its author and publication details, and a reviewer when one is recorded.
Use the method, then test it.
Work through the example, try a new set of values, and return to the concept you missed. For code-specific requirements, use the assigned reference and edition for your program.