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 Nuclear Power Plant Works — Uranium atoms split inside a sealed steel vessel, heating water that is pressurised so hard it cannot boil. That water never leaves the dome — it only passes its heat to a second, separate loop, and it is that clean steam which spins the turbine.
- 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 AC and DC Conversion Works — Wall power sloshes back and forth; batteries only hold one-way DC. Inside an online (double-conversion) UPS, four diodes straighten AC into DC and four switches shake it back into AC.
- How an Electric Generator Works — A petrol engine spinning one switchable magnet inside a ring of copper — and the moment you switch a light on, the shaft gets harder to turn.
- 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.
- What Happens When You Flip a Switch — Flipping a switch sends nothing anywhere. The electrons were already in the filament — on AC they never leave. What races down the wire is the push.