Module 3 Electrical Fundamentals
Charge, DC and AC circuits, resistance, capacitance, magnetism, machines, generation and distribution.
How to prepare for UK Part-66 basic-knowledge examinations
Fix the intended A, B1, B2, B2L, B3, L or C route; use the regulatory module matrix and knowledge levels; then rehearse the exact MCQ and essay components that apply to each selected module.
Core concepts
Concept 1
Voltage, current, resistance, power and energy must be distinguished and related through circuit laws.
Exam cue: Identify the circuit topology before calculating an equivalent value.
Concept 2
Series and parallel behaviour, capacitance, inductance and impedance determine circuit response and measurement.
Exam cue: State whether a value is DC, RMS, peak or frequency dependent.
Concept 3
Magnetism and electromagnetic induction underpin generators, motors, transformers and aircraft electrical distribution.
Exam cue: Use the schematic and isolation procedure before measuring.
Risk pitfalls and guardrails
Treating current as consumed by a component.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Confusing open-circuit voltage with loaded performance.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Measuring resistance on an energised circuit.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Memory anchors
Ohm
Voltage, current and resistance are linked by Ohm's law.
Series
Series components share current; their voltage drops combine.
Parallel
Parallel branches share voltage; their currents combine.
Induction
A changing magnetic field can induce an electromotive force.
Safe Measure
Isolate, prove and use the correct instrument range and connection.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is conventional current direction in an external DC circuit?
A 24 V supply is connected across 6 Ω. What current flows?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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