Category
How It Works
Everyday things, explained step by step.
20263 articles
How a Lift Stays Safe: Brakes, Governors and Rails
A lift has several independent safeguards: a counterweight, a spring-applied brake, an overspeed governor and a safety gear that grips the rails.
How Bicycle Gears Work: Chainrings, Cogs and Derailleurs
Bicycle gears change how far you travel per pedal turn. See how chainrings, cogs and derailleurs work, how a gear ratio is worked out, and what cross-chaining is.
How a Refrigerator Cools: The Four-Part Cycle
A fridge does not make cold. It moves heat from inside to your kitchen using a compressor, condenser, expansion valve and evaporator.