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  2. Ecological efficiency - Wikipedia

    en.wikipedia.org/wiki/Ecological_efficiency

    The rest of the energy input into cultivating feed is respired or egested by the livestock and unable to be used by humans. Out of a total of 28,400 terawatt-hours (96.8 × 10 ^ 15 BTU ) of energy used in the US in 1999, 10.5% was used in food production, [ 3 ] with the percentage accounting for food from both producer and primary consumer ...

  3. Lipid metabolism - Wikipedia

    en.wikipedia.org/wiki/Lipid_metabolism

    Lipid metabolism is often considered the digestion and absorption process of dietary fat; however, there are two sources of fats that organisms can use to obtain energy: from consumed dietary fats and from stored fat. [5] Vertebrates (including humans) use both sources of fat to produce energy for organs such as the heart to function. [6]

  4. Electricity generation - Wikipedia

    en.wikipedia.org/wiki/Electricity_generation

    Centralised energy sources are large power plants that produce huge amounts of electricity to a large number of consumers. Most power plants used in centralised generation are thermal power plants meaning that they use a fuel to heat steam to produce a pressurised gas which in turn spins a turbine and generates electricity. This is the ...

  5. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    Electricity is a very convenient way to transfer energy, and it has been adapted to a huge, and growing, number of uses. [75] The invention of a practical incandescent light bulb in the 1870s led to lighting becoming one of the first publicly available applications of electrical power.

  6. The Center for Energy and Environmental Research in the Human ...

    en.wikipedia.org/wiki/The_Center_for_Energy_and...

    The CENHS Cultures of Energy symposium is currently the only annual energy humanities conference in the world and invites 12-15 speakers to Rice each Spring. [ 10 ] The CENHS blog features commentaries from CENHS fellows and other scholars in energy humanities, field reports about energy culture in Houston, conference calls, reviews, book ...

  7. Renewable energy - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy

    From hot springs, geothermal energy has been used for bathing since Paleolithic times and for space heating since ancient Roman times. [280] Moving into the time of recorded history, the primary sources of traditional renewable energy were human labor, animal power, water power, wind, in grain crushing windmills, and firewood, a traditional ...

  8. Human power - Wikipedia

    en.wikipedia.org/wiki/Human_power

    Human power is the rate of work or energy that is produced from the human body. It can also refer to the power (rate of work per time) of a human. Power comes primarily from muscles , but body heat is also used to do work like warming shelters , food, or other humans.

  9. Fuel - Wikipedia

    en.wikipedia.org/wiki/Fuel

    Fuels are also used in the cells of organisms in a process known as cellular respiration, where organic molecules are oxidized to release usable energy. Hydrocarbons and related organic molecules are by far the most common source of fuel used by humans, but other substances, including radioactive metals, are also utilized.