Electricity and magnetism are the invisible forces that quietly run the modern world. Flick a switch, charge a phone, start a car, stream a song — every one of them is electric charge on the move, nudged along by forces you cannot see but use every minute of the day.

The deepest surprise in all of physics is hidden here: electricity and magnetism are not two separate things but two faces of one force. A moving magnet makes electricity, and a moving current makes magnetism — a two-way link that powers every motor, generator and transformer on Earth.

Two branches to explore

Start with electricity — charge, current, voltage, and the circuits that carry power where it's needed. Then discover the hidden partnership in electromagnetism, where electricity and magnetism turn out to be the same thing wearing different hats — the idea behind every electric motor and the generators in every power station.