Electrical Fundamentals
For engineers and technicians building the circuit vocabulary and analysis skills required across all controls, panel design, and machine work. Includes circuit theory, passive components, conductor sizing, and IEC earthing systems.
Recommended entry modules
- Electrical Quantities and Circuit Language — vocabulary and circuit topology
- Kirchhoff’s Laws and Systematic Analysis — systematic analysis for real circuits
- Conductor Ampacity and Termination Temperature — NEC table reading and sizing rules
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Electrical Quantities and Circuit Language
Core
Build the shared vocabulary — voltage, current, resistance, power — and learn to read circuit topology before solving anything. |
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Series, Parallel, and Divider Methods
Reduce series and parallel networks and apply voltage and current dividers to find operating points in real circuits. |
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Kirchhoff's Laws and Systematic Analysis
Core
Apply KCL and KVL with nodal and loop analysis to solve circuits that cannot be simplified by series/parallel rules alone. |
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Equivalent Circuit Methods
Simplify complex networks to Thevenin or Norton equivalents; apply source transformation and superposition for multi-source problems. |
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Electrical Equations Reference
Quick-reference sheet for Ohm's law, power, dividers, KCL/KVL, and capacitor/inductor energy — formatted for fast lookup. |
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Passive Components
Understand resistors, capacitors, and inductors — their ratings, stored energy, and behavior in DC and AC circuits. |
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Diodes, Transistors, and Switching Basics
Cover diode families, BJT/MOSFET/IGBT switching modes, and flyback diodes — the semiconductor layer under every drive and power supply. |
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Conductor Ampacity and Termination Temperature
Core
Read NEC ampacity tables correctly, apply correction factors, and understand the 60/75°C termination temperature rule. |
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IEC Earthing System Types
Understand how TN-C, TT, TN-C-S, TN-S, and IT earthing systems affect fault-current path, protective-device selection, and touch-voltage risk in machine and panel design. |
This site is an independent educational reference for industrial automation standards. It paraphrases and organizes guidance in original language; it is not a substitute for the official published standards, professional engineering judgment, or legal review, and content has not been independently verified against current published editions.
Items marked Review pending await technical review against the identified edition. Items marked Planned have no reviewed source material behind them. Do not rely on this site for compliance determinations, safety-critical design decisions, or legal interpretation.