Electrical Trade Level One

Interpret basic circuit diagrams containing a source, conductors, a load, control equipment, and protection.

Predict current and load operation when a basic circuit is open, closed, or short-circuited.

Calculate an unknown voltage, current, or resistance in a single-resistor circuit using Ohm’s law.

Solve multi-step Ohm’s law problems that require SI-prefix conversions and formula rearrangement.

Calculate electrical power using P = VI, P = I²R, or P = V²/R.

Relate the heating, magnetic, chemical, and physiological effects of current to common applications and hazards.

Distinguish fixed, variable, and special-purpose resistors by their circuit function.

Determine a resistor’s nominal value and tolerance from its colour bands.

Calculate the minimum and maximum resistance permitted by a resistor’s tolerance.

Predict how material, length, cross-sectional area, and temperature affect conductor resistance.

Calculate equivalent resistance for resistors connected in series.

Calculate circuit current and individual voltage drops in a series circuit using Ohm’s law and Kirchhoff’s voltage law.

Calculate power dissipated by each resistor and select a suitable resistor power rating.

Diagnose the electrical effects of an open-circuit or short-circuit fault in a series resistor network.

Explain the energy conversions that occur in common chemical, photovoltaic, and electromechanical EMF sources.

Distinguish electromotive force, terminal potential difference, and component voltage drop.

Calculate total EMF for series-aiding and series-opposing voltage sources.

Calculate electrical energy from power and time using joules and kilowatt-hours.

Construct concise written responses explaining electrical principles with correct terminology, units, and formulas.

Complete a timed mixed-format practice exam covering Level One concepts, calculations, and resistor problems.

Classify errors from a practice exam as concept, formula-selection, unit-conversion, calculation, or interpretation errors and choose the appropriate correction strategy.