Technologies
Each entry explains a technology, the problems it solves and its connections.
Filters: EnergyClear
Cement rotary kiln firing
Gradually adopted in industrial cement production in the late 19th century · matureEnergy · Industry · MaterialsA slowly rotating, inclined kiln moves and heats material, enabling continuous production of cement clinker.
Lime burning
Archaeological evidence of lime burning dates to around 10000 BCE · matureEnergy · Industry · MaterialsControlled heating of calcareous rock produces reactive lime, transforming natural rock into a workable raw material for binders.
Charcoal production
Known in antiquity; became a metallurgical fuel before and around modern industrialization · matureEnergy · Industry · MaterialsHeating wood with no oxygen or limited oxygen to obtain a solid fuel with a higher fixed-carbon content and better suitability for high-temperature combustion.
Control of fire
Archaeological evidence of controlled fire use appears from about 1 million years ago · matureEnergy · MaterialsIgniting, sustaining, regulating, and using flames turns combustion in the environment into a repeatable source of heat.
Electric generators
Developed during the 19th century from magneto-electric machines into practical self-excited generators · matureEnergy · IndustryA device that converts rotational mechanical work into electrical energy through electromagnetic induction.
Electric power systems and grids
Central power stations appeared in 1882; scalable AC transmission systems took shape in the late 19th century · matureEnergy · Industry · Information · TransportA system for supplying and consuming electrical energy that combines generation, voltage transformation, transmission, distribution, protection, and dispatch.
Electromagnetic induction
Discovered in 1831; self-excited generators developed in the late 19th century · matureEnergy · Information · Mathematics and MethodologyThe physical principle by which changing magnetic flux induces an electromotive force in a conductor, linking mechanical motion with electric current.
Metal smelting
Early metal smelting appeared from around 5000 BCE; large-scale furnace workshops emerged in the Bronze Age · matureEnergy · Industry · MaterialsExtracts metals from ores using controlled high temperatures and a reducing environment, then produces usable materials through melting, casting, or forging.
Photovoltaic cell
1839: discovery of the photovoltaic effect; 1954: silicon photovoltaic cells became practical for power generation · matureEnergy · Industry · MaterialsA device that uses the photovoltaic effect in semiconductors to convert solar radiation directly into direct-current electricity.
Steam engines
Improved in the 18th century and adopted in factories, mines, and transport · replacedEnergy · Industry · TransportA heat engine that converts the pressure of steam produced by a boiler into reciprocating or rotary mechanical work.