Energy & Green Tech
There is a largely untapped energy source along the world's coastlines: the difference in salinity between seawater and freshwater. A new nanodevice can harness this difference to generate power.
Sep 24, 2023
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Energy & Green Tech
Lithium metal batteries have numerous notable advantages over other existing battery systems, including high energy density. Nonetheless, the use of most existing high-energy lithium metal batteries in extreme environments ...
Engineering
A team of chemists and engineers affiliated with a host of institutions in China, working with one colleague from the U.S. and another from the U.K., has developed new technology that harvests energy from low-speed wind. ...
Energy & Green Tech
A new study, modeling the potential of solar-powered vehicles in the urban context in 100 cities across the world, shows that solar energy provides a range between 11 and 29 km per day, reducing charging needs by half.
Sep 22, 2023
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Electronics & Semiconductors
The sun sends enormous amounts of energy to the earth. Nevertheless, some of it is lost in solar cells. This is an obstacle in the use of organic solar cells, especially for those viable in innovative applications. A key ...
Sep 26, 2023
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Energy & Green Tech
Two senior National Renewable Energy Laboratory (NREL) researchers recently published an article in the Journal of Photovoltaics tracking changes to the world's electricity supply over the past several years.
Sep 27, 2023
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Energy & Green Tech
Almost 2,500 miles and numerous differences in size, culture, and climate separate Los Angeles, California, from Tehuantepec, Mexico. At the same time, these places share striking similarities when it comes to ambitions for ...
Sep 25, 2023
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Energy & Green Tech
Ships carry around 90% of traded goods and emit about 3% of global CO₂. The International Maritime Organization (IMO), the UN agency responsible for regulating shipping, recently set out plans for this industry to reach ...
23 hours ago
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Business
Rishi Sunak, the UK prime minister, has announced his government will scrap or delay a number of measures designed to help the UK reach net zero by 2050, with a particular focus on housing. This includes getting rid of impending ...
Sep 22, 2023
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Energy & Green Tech
While the United States has excellent wind resources over much of the country, some locations are less windy and, as a result, have not seen much wind energy development. Harnessing wind power in a cost-effective manner has ...
Sep 25, 2023
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In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.
Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.
Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.
This text uses material from Wikipedia, licensed under CC BY-SA
