Power & the Grid
How electricity is made, stepped up, and carried to your wall.
- How a Coal Power Plant Works — Pulverized coal burns in a boiler to raise steam at over 500°C, which blasts through a multi-stage turbine and generator before condensing back to water in a closed loop, cooled by the plant's iconic tower.
- How a Hydroelectric Plant Works — A dam trades a reservoir's height for speed down a penstock, spins a turbine and its generator, and sends the current out through a step-up transformer — gravity converted to grid power.
- How a Lithium-Ion Battery Works — Nothing inside is burned or used up — it is a shuttle. Lithium ions cross back and forth between two layered electrodes, and the cell ages fastest exactly where most phones sit overnight: parked at 100%.
- How a Solar Panel Works — Photons that left the sun's core 100,000 years ago and crossed 150 million km of space strike a silicon wafer and knock electrons loose — a buried junction sweeps them into a current, sixty cells wired in series turning sunlight into usable DC.
- How a Transformer Works — Two coils sharing an iron core, magnetically coupled by nothing but a changing current — why AC can trade voltage for current and DC never could.
- How a Wind Turbine Works — The blades are wings, not sails — they are pulled around by lift, and the tip ends up moving seven times faster than the wind itself, at close to 300 km/h.
- How Power Reaches Your House — A step-up transformer trades current for voltage so the grid can send power hundreds of miles for a fraction of the heat loss, then a chain of substations and poles trades it back down, in stages, until it is safe for a wall socket.