Energy & Green Tech

Japan OKs plan to release Fukushima nuclear plant wastewater

Japan's nuclear regulator on Wednesday approved plans by the operator of the wrecked Fukushima nuclear plant to release its treated radioactive wastewater into the sea next year, saying the outlined methods are safe and risks ...

Robotics

Robot hives in Israel kibbutz hope to keep bees buzzing

They function as normal hives, but apiaries built at a kibbutz in Israel's Galilee are decked out with high-tech artificial intelligence systems set to ensure longevity for these vital pollinators.

Energy & Green Tech

Homes fitted with new technology could make the grid smarter

Researchers at Pacific Northwest National Laboratory (PNNL) have developed a control system that could make most of America's homes more capable partners in managing the nation's electricity resources.

Business

Opinion: Greenwashing decarbonization

An important piece of reporting by the New York Times and advocacy by the Environmental Defense Fund provides insight into the complexity of decarbonization and the need for care when auditing corporate climate disclosures. ...

Energy & Green Tech

Mapping how energy flows in organic solar cells

Efficient and environmentally friendly solar cells are required for a transition to a fossil-free energy supply. Researchers at Linköping University have mapped how energy flows in organic solar cells, something that previously ...

Energy & Green Tech

The colors of hydrogen explained

Hydrogen has emerged as the energy technology that could help nations like Australia to decarbonize their economies. But did you know that, beyond green and blue hydrogen, there's a whole rainbow of hydrogen types?

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Energy

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