Concepts

Electrical Fundamentals

Charge, electric fields, potential and the physical ideas behind every circuit.

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Electricity is the presence and motion of electric charge. Learn what charge is, how current flows in a circuit and how electric...

Electric charge is the property that makes particles attract or repel and that gives rise to electric fields. Learn its unit, it...

An electric field describes the force a charge would feel at each point in space. Learn field strength, field lines, the inverse...

Electric potential is potential energy per unit charge at a point. Learn how potential differs from voltage, how it is measured...

Every formula used here, with variable definitions, units, application conditions and a worked example.

Check your understanding with transparent calculators that show the formula and substitution.