Robotics
Origami robots can be formed by tightly integrating multiple functions of actuation, sensing and communication. But the task is challenging as conventional materials including plastics and paper used for such robotic designs ...
Engineering
No one would ever imagine crumpling up their smartphone, television or another electronic device. Today's displays—which are flat, rigid and fragile—lack the ability to reshape to interactively respond to users.
Mar 23, 2022
0
108
Energy & Green Tech
According to the International Energy Agency (IEA), global hydrogen demand is expected to reach 530 million tons in 2050, a nearly six-fold increase from 2020.
Oct 4, 2023
0
39
Engineering
When looking at the future of production of micro-scale organic electronics, Mohammad Reza Abidian—associate professor of Biomedical Engineering at the University of Houston Cullen College of Engineering—sees their potential ...
Jun 24, 2022
0
98
Energy & Green Tech
Researchers at MIT say they have created a new material that will pave the way to faster charging batteries.
Energy & Green Tech
Polymer-air batteries often face challenges related to stability, kinetics and conductivity. In response, Dr. Jodie Lutkenhaus has developed a method to use a polymer as an anode in these batteries.
Dec 21, 2023
0
96
Electronics & Semiconductors
With more than 1,000 nerve endings, human skin is the brain's largest sensory connection to the outside world, providing a wealth of feedback through touch, temperature and pressure. While these complex features make skin ...
Jan 26, 2024
2
116
Electronics & Semiconductors
A metal foam could underpin a low-cost method for generating carbon-free fuels, researchers from KAUST have shown. The team seamlessly coated the foam with iron and cobalt nanomaterials to create a highly active electrode ...
Mar 10, 2022
0
933
Energy & Green Tech
There are a handful of ways to produce hydrogen fuel without emitting carbon into Earth's atmosphere. One involves using electricity to split water into hydrogen and oxygen.
Jun 6, 2022
0
202
Energy & Green Tech
As electric vehicles grow in popularity, the spotlight shines more brightly on some of their remaining major issues. Researchers at The University of Texas at Austin are tackling two of the bigger challenges facing electric ...
Sep 26, 2022
0
797
Electrical conductivity or specific conductance is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ is defined as the ratio of the current density to the electric field strength :
It is also possible to have materials in which the conductivity is anisotropic, in which case σ is a 3×3 matrix (or more technically a rank-2 tensor) which is generally symmetric.
Conductivity is the reciprocal (inverse) of electrical resistivity, ρ, and has the SI units of siemens per metre (S·m-1):
Electrical conductivity is commonly represented by the Greek letter σ, but κ (esp. in electrical engineering science) or γ are also occasionally used.
An EC meter is normally used to measure conductivity in a solution.
This text uses material from Wikipedia, licensed under CC BY-SA
