Engineering
Rice University engineers can turn sunlight into hydrogen with record-breaking efficiency thanks to a device that combines next-generation halide perovskite semiconductors with electrocatalysts in a single, durable, cost-effective ...
Jul 20, 2023
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3824
Electronics & Semiconductors
In recent years, material scientists have been trying to develop soft and flexible fibers that could be used to create new electronics. These fibers could, for example, be used to create smart sensing clothes, energy solutions, ...
Energy & Green Tech
Hydrogen is viewed as a promising alternative to fossil fuel, but the methods used to make it either generate too much carbon dioxide or are too expensive. Rice University researchers have found a way to harvest hydrogen ...
Sep 14, 2023
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152
Energy & Green Tech
Transforming base materials into gold was one of the elusive goals of the alchemists of yore. Now Professor Raffaele Mezzenga from the Department of Health Sciences and Technology at ETH Zurich has accomplished something ...
Feb 29, 2024
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173
Energy & Green Tech
Thermal decomposition is helping to green two major EU manufacturing industries.
Jan 30, 2024
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73
Robotics
Science fiction films portray the idea relatively simply: the terminator—who either tries to destroy or rescue humanity—is such a perfect humanoid robot that in most cases it is superior to humans. But how well do humanoid ...
Nov 7, 2023
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69
Energy & Green Tech
Formic acid, which can be produced electrochemically from carbon dioxide, is a promising energy carrier. A Chinese research team has now developed a fast-charging hybrid battery system that combines the electrochemical generation ...
Oct 31, 2023
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52
Engineering
It already works: there are several approaches to using solar energy to split water and produce hydrogen. Unfortunately, this "green" hydrogen has so far been more expensive than "gray" hydrogen from natural gas.
Oct 5, 2023
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93
Engineering
Transistors, semiconducting devices that regulate, amplify and generate the flow of electrical current, are central components of most electronics. Electronics engineers have been trying to develop increasingly smaller transistors, ...
Energy & Green Tech
Solar energy is the cheapest and most accessible form of energy. Now, it promises to be more efficient than ever. Scientists from a Chinese solar technology company have developed a new type of solar cell that could be a ...
May 9, 2023
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108
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
