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Definitions (77)
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ampere
The standard unit used to measure the strength of an electrical current.
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ALTERNATING CURRENT
Electric current in which the electrons periodically and rapidly change direction.
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atlatl
A tool used by prehistoric hunters to throw projectile weapons such as spears and darts. It consisted of a long, hollowed-out rod made from bone or wood, with a hook at one end and a handle at the oth [..]
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atom
The most basic unit comprising matter. Atoms consist of electrons, protons and neutrons.
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aurochs
Extinct form of wild ox believed by archaeologists to have been first domesticated in Asia and Europe by around 6,000 BCE.
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Battery
Two or more cells connected together to store electricity.
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Biodiesel
Diesel fuel made from biomass.
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Bioenergy
Any energy derived from biological sources.
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Biofuel
Any fuel derived from a biomass, such as wood or ethanol.
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Biogas
Methane-rich gas produced by the breakdown and decomposition of organic material, most commonly manure, plants, or food waste.
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