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.
Lenz’s Law
Lenz’s law says an induced current opposes the change that created it. Learn the sign of induced EMF, energy conservation and ex...
Coulomb’s Law
Coulomb’s law gives the force between two point charges: it grows with the charges and falls with the square of the distance. Le...
Direct Current (DC) Electricity
Direct current flows in one direction at a steady value. Learn DC sources, battery capacity, energy calculations and why vehicle...
Series Circuits
In a series circuit, components form a single path so the same current flows through each. Learn series resistance, voltage divi...
Parallel Circuits
In a parallel circuit, branches share the same voltage and currents add. Learn equivalent resistance, branch currents and why ve...
Series–Parallel Circuits
Most real circuits combine series and parallel sections. Learn how to reduce a network step by step, find branch currents and ve...
Voltage Divider
A voltage divider uses two resistors to produce a fraction of the input voltage. Learn the formula, the loading effect and where...
Current Divider
A current divider splits a total current between parallel branches. Learn the formula, why the smaller resistance takes more cur...
Alternating Current (AC)
Alternating current reverses direction every half cycle. Learn how AC is generated, how its waveform is described, and why the g...
Frequency and Period
Frequency is the number of cycles per second and period is the time for one cycle. They are reciprocals and together they set re...
RMS Value
The RMS value is the equivalent steady DC value that produces the same heating. It is the value used for AC power, ratings and t...
Phase Angle
Phase angle describes how far one waveform leads or lags another in time. It sets power factor, reactive power and the behaviour...