Electrical Pre-Trade Fundamentals

Apply Kirchhoff’s current law to solve or verify currents at a circuit junction.

Apply the current-divider relationship to a two-branch parallel circuit.

Reduce a series-parallel resistor network to its equivalent resistance.

Determine how an open circuit or short circuit changes expected values in a resistor network.

Identify standard symbols for sources, loads, components, switches, protective devices, meters, and earth connections.

Translate between a basic wiring diagram and its corresponding schematic diagram.

Determine resistance and tolerance from resistor markings or colour bands.

Distinguish the basic circuit functions of resistors, capacitors, and inductors.

Interpret normally open and normally closed contacts and predict how switch, relay, or contactor operation changes their states.

Trace the sequence of operation in a basic control circuit.

Determine a diode’s conduction state from its polarity in a DC circuit.

Infer the expected energised or de-energised state of each load from a given circuit diagram.

Determine magnetic-field direction around a current-carrying conductor.

Determine the magnetic polarity of a current-carrying coil or solenoid.

Predict how current, turns, core material, and air gap affect electromagnet strength.

Determine force or motion direction using the motor principle.

Determine induced-voltage direction from a change in magnetic flux.

Predict how flux, speed, and conductor arrangement affect generated voltage.

Calculate transformer secondary voltage using the turns ratio.

Use ideal power conservation to calculate a missing primary or secondary transformer current.

Identify amplitude, instantaneous value, peak value, and a complete cycle on a sinusoidal waveform.

Calculate frequency from period or period from frequency.

Convert between RMS and peak values for a sinusoidal voltage or current.

Determine the voltage-current phase relationship for purely resistive, inductive, and capacitive AC loads.

Calculate inductive reactance from frequency and inductance.

Calculate capacitive reactance from frequency and capacitance.

Calculate impedance and current in a simple series R-L or R-C circuit.

Calculate real power, apparent power, or power factor in a single-phase AC load.

Trace electrical energy from generation through transmission and distribution to a consumer installation.

Explain why voltage is transformed for efficient transmission and safe distribution.

Distinguish the functions of active, neutral, protective-earth, and bonding conductors.

Identify common single-phase and three-phase supply arrangements from diagrams.

Calculate line or phase quantities in a balanced basic three-phase star or delta load.

Trace an earth-fault current path in a basic New Zealand MEN installation.

Explain how the MEN connection supports automatic disconnection during an earth fault.

Identify electric-shock risks caused by an incorrectly connected neutral or protective-earth conductor.

Identify common cable types and state a suitable application for each.

Determine conductor function from standard New Zealand identification colours and markings.

Apply a supplied correction factor to a cable’s tabulated current-carrying capacity.

Select a conductor size from supplied data for a stated load and installation condition.

Calculate voltage drop for a specified cable run using supplied data.

Compare a calculated voltage drop with a stated allowable limit.

Select a suitable termination method for a stated conductor and accessory.

Identify installation defects involving cable support, mechanical protection, enclosure rating, or termination quality.

Distinguish overload, short-circuit, and earth-leakage faults from scenario evidence.

Explain how a fuse interrupts excessive current.

Explain how an MCB responds to overload and short-circuit current.

Explain how an RCD detects residual current.

Identify the limitations of an RCD in common shock and fault situations.

Select a suitable protective-device type and rating from supplied circuit information.

Determine whether a protective device provides appropriate protection for a stated cable and load.

Predict which protective device should operate for a given fault scenario.

Distinguish the roles of the Electricity Act, Electricity (Safety) Regulations, standards, and workplace procedures.

Use supplied New Zealand requirements to identify work a pre-trade learner may perform only under appropriate supervision.

Determine the responsible person’s duties in a basic supervised-work scenario.

Select controls for electrical hazards using the hierarchy of controls.

Identify suitable personal protective equipment for a stated electrical task.

Apply isolation, lockout, tagging, and verification steps in the correct order.

Choose the correct immediate response to an electric-shock or electrical-fire scenario.

Locate and apply a relevant requirement in supplied current New Zealand regulatory or standards material.

Select a suitable instrument and measurement category for a stated electrical test.

Choose suitable meter settings and connection points for voltage, current, and resistance measurements on a circuit diagram.

Apply the prove-test-prove sequence to verify de-energisation in a simulated safe-isolation scenario.

Interpret continuity-test results for a protective conductor or bonding connection.

Interpret insulation-resistance test results using a stated acceptance criterion.

Interpret polarity-test results for a basic circuit.

Interpret RCD test results using stated trip-time and operating-current criteria.

Use supplied measured values to locate a single open-circuit, short-circuit, or earth fault.

Use topic cues and option elimination to identify the required formula, rule, or test procedure in multiple-choice and written questions.

Show calculation steps, units, and rounding clearly enough to earn method marks.

Complete a timed set of formula-rearrangement and electrical-calculation questions.

Complete a timed set of circuit-diagram interpretation and fault-finding questions.

Complete a timed set of safety, testing, and New Zealand regulation questions.

Perform a simulated or trainer-supervised practical task using a safe sequence, correct instrument choice, and recorded results.

Diagnose errors in completed answers by comparing them with worked solutions or marking criteria.

Complete a timed mixed-topic exam section using the permitted calculator and formula sheet.