Electrical concepts, clearly explained
From charge and Ohm’s law to protective earthing and EV high-voltage systems. Each concept includes a definition, three levels of explanation, formulas, solved examples, applications, measurement notes, mistakes and safety guidance.
Fuse
A fuse protects a circuit by melting to interrupt overcurrent. Learn ratings, time-current behaviour, I²t, selection rules, test...
Circuit Breaker
A circuit breaker interrupts overcurrent and can be reset. Learn thermal-magnetic trips, curves, breaking capacity, selectivity,...
Overcurrent Protection
Overcurrent protection coordinates devices and conductors against overload and short circuit. Learn selection rules, fault curre...
Earthing (Grounding)
Earthing gives fault current a safe path and stabilises voltage reference. Learn protective earthing, fault loops, earth resista...
Equipotential Bonding
Bonding connects conductive parts so they stay at nearly the same potential. Learn main and supplementary bonding, conductor siz...
Automotive Electrical System
A vehicle electrical system stores, generates and distributes 12 V or 24 V power. Learn the battery, alternator, starter, chassi...
Automotive Battery
The automotive battery stores energy for starting and reserve. Learn capacity, CCA, state of charge, energy, testing and safe ha...
Alternator
The alternator generates AC and rectifies it to charge the battery. Learn three-phase output, regulation, current limits, testin...
Industrial Electrical Installation
Industrial installations distribute three-phase power safely through switchgear, cables, protection and earthing. Learn design,...
Contactor
A contactor switches motor and industrial loads remotely and repeatedly. Learn coil circuits, main contacts, overload relays, te...
EV High-Voltage System
An EV traction system operates at dangerous high voltage and is isolated from the chassis. Learn architecture, isolation, safety...
EV Charging
EV charging transfers energy from the grid to the battery under careful control. Learn AC and DC charging, power, time, safety a...