⚛ Curious Minds
Science Lab

Electricity is the movement of tiny particles called electrons. Every atom has them — and when electrons jump or flow from one place to another, we get everything from a tiny static spark on a doorknob to a giant bolt of lightning in the sky. This module covers the basics: electric charge, static electricity, and electric current.

When you flip a light switch, you're closing a circuit — a complete loop that lets electrons flow from a power source, through a wire, into the bulb, and back again. Break the loop anywhere and the light goes out. Electricity flows easily through conductors (like copper) but is blocked by insulators (like rubber and plastic).

Where does the electricity in your wall socket come from? Most power plants — coal, gas, nuclear, hydro, even wind — do the same trick: they spin a generator, which moves magnets past coils of wire to push electrons through the grid. Batteries are different: they make electricity from a chemical reaction, stored and ready to go wherever you are.

Every magnet has a north pole and a south pole. Opposite poles attract, matching poles push apart — and around every magnet is an invisible magnetic field. The most amazing magnet of all is under your feet: Earth itself is a giant magnet, powered by swirling liquid iron deep in its core. That's why a compass needle always knows which way is north.

Here's the big secret of this whole topic: electricity and magnetism are two sides of the same force — electromagnetism. Run electricity through a coil of wire and it becomes a magnet you can switch on and off! Electromagnets power speakers, electric motors, scrapyard cranes… and maglev trains that float above their tracks and race along at over 400 km/h.