Energy & Green Tech
Aviation's huge carbon footprint could shrink significantly with electrification. To date, however, only small all-electric planes have gotten off the ground. Their electric motors generate hundreds of kilowatts of power. ...
Jun 8, 2023
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77
Robotics
A team of UCLA engineers and their colleagues have developed a new design strategy and 3D printing technique to build robots in one single step.
Jun 16, 2022
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277
Energy & Green Tech
Tulane University researchers are part of a team of scientists who have developed a hybrid solar energy converter that generates electricity and steam with high efficiency and low cost.
Jul 15, 2020
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399
Engineering
Mass spectrometers, devices that identify chemical substances, are widely used in applications like crime scene analysis, toxicology testing, and geological surveying. But these machines are bulky, expensive, and easy to ...
Jan 4, 2024
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138
Robotics
The sight of a RoboBee careening towards a wall or crashing into a glass box may have once triggered panic in the researchers in the Harvard Microrobotics Laboratory at the Harvard John A. Paulson School of Engineering and ...
Nov 4, 2019
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291
Hardware
A collaboration between University of Toronto Engineering, Northwestern University and the University of Toledo has resulted in an all-perovskite tandem solar cell with extremely high efficiency and record-setting voltage.
Nov 15, 2022
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353
Robotics
Researchers at ETH Zurich have developed a technique for manufacturing micrometer-long machines by interlocking multiple materials in a complex way. Such microrobots will one day revolutionize the field of medicine.
Nov 24, 2020
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148
Robotics
In the quest to build smart skin that mimics the sensing capabilities of natural skin, ionic skins have shown significant advantages. They're made of flexible, biocompatible hydrogels that use ions to carry an electrical ...
Apr 28, 2022
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36
Engineering
Houses have been getting progressively "smarter" for decades, but the next generation of smart homes may offer what two Case Western Reserve University scientists are calling an "Internet of Ears."
Nov 15, 2018
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37
Engineering
Transistors that can change properties are important elements in the development of tomorrow's semiconductors. With standard transistors approaching the limit for how small they can be, having more functions on the same number ...
Jul 3, 2023
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229
In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday.
The electric field is a vector field with SI units of newtons per coulomb (N C−1) or, equivalently, volts per metre (V m−1). The SI base units of the electric field are kg·m·s−3·A−1. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
A moving charge has not just an electric field but also a magnetic field, and in general the electric and magnetic fields are not completely separate phenomena; what one observer perceives as an electric field, another observer in a different frame of reference perceives as a mixture of electric and magnetic fields. For this reason, one speaks of "electromagnetism" or "electromagnetic fields." In quantum mechanics, disturbances in the electromagnetic fields are called photons, and the energy of photons is quantized.
This text uses material from Wikipedia, licensed under CC BY-SA
