DC Theory and Measurement
This module is written as a textbook-style training sequence. Work through the lessons in order, complete the practical tasks on approved training gear and keep your calculations and test records as evidence.
Voltage, Current and Resistance
The physical meaning of the three core electrical quantities and how they appear in real circuits.
Ohm’s Law With Trade Calculations
Applying V = I × R to lamps, heaters, voltage drop and fault symptoms.
Electrical Power and Energy
Watts, kilowatts, watt-hours, heating effect and appliance energy use.
Series Circuits
Current, total resistance, voltage drops and failure symptoms in one-path circuits.
Parallel Circuits
Branch currents, total resistance, common voltage and why parallel loads are used.
Series-Parallel Networks
Breaking mixed networks into workable sections for calculation and diagnosis.
Kirchhoff’s Laws for Electricians
Current at junctions and voltage around loops, applied without excessive mathematics.
Conductors, Insulators and Resistance
Material, length, cross-sectional area, temperature and connection quality.
Batteries, Polarity and DC Supplies
Cells, internal resistance, charging basics and common DC system mistakes.
Meter Loading and Measurement Errors
Why readings can mislead and how to test under realistic circuit conditions.