CODESAFE CANADA · STUDY RESOURCES
Work it through. Check it. Revisit it.
A revision sheet for G3, G2, electrical and other trade learners.
01 · A formula is a relationship
For a simple resistive DC circuit: V = I × R · I = V ÷ R · R = V ÷ I
Voltage V in volts (V); current I in amperes (A); resistance R in ohms (Ω).
Worked example: 24 V ÷ 48 Ω = 0.5 A = 500 mA. At the same voltage, twice the resistance gives half the current.
02 · Keep the units on every line
| Convert | Operation | Example |
|---|---|---|
| in → mm | × 25.4 | 2.5 in = 63.5 mm |
| ft → m | × 0.3048 | 10 ft = 3.048 m |
| kW → W | × 1,000 | 1.5 kW = 1,500 W |
| mA → A | ÷ 1,000 | 500 mA = 0.5 A |
| °F reading → °C | (°F − 32) × 5/9 | 68 °F = 20 °C |
For a temperature difference, use the scale factor only. Nominal pipe sizes are labels, not dimensions for direct conversion.
03 · Record a codebook lookup you can repeat
- Identify the topic, equipment, conditions, units, and requested result.
- Locate the topic using your assigned reference’s contents or index; check the scope.
- For tables, read the row, column, units, and applicable notes together.
- Record the title, edition, clause/table, conditions, and your explanation.
Reference + edition: ____________________________________________________
Clause/table + conditions: _________________________________________________
04 · Turn one mistake into a study task
Question/topic:
My mistake and its cause (concept, formula, units, wording, or time):
The correction in my own words:
One new example to solve + when I will revisit it: