Material Conductivity: Material with Variable Ohmic Resistance

Thread starter sondreL
Start date Jul 26, 2014
Tags

Conductivity Material

AI Thread Summary

Materials that can transition from non-conductive to conductive states through external stimuli, such as light or electromagnetic waves, do exist. Photoresistors, or light-dependent resistors (LDRs), are a prime example, as their resistance decreases with increased light exposure. Other materials, like certain semiconductors and phase-change materials, can also exhibit variable ohmic resistance under specific conditions. These materials have applications in sensors and electronic devices where variable conductivity is essential. The discussion highlights the potential for innovative uses of such materials in technology.

Jul 26, 2014

sondreL

Is there any such material which can be made to conduct from a non conducting state by external means like shining a light or any other EM wavelenght on it or other means , that could alter the material ohmic resistance to electric current

Physics news on Phys.org

Jul 26, 2014

BOAS

Do you mean something like an LDR?

http://en.wikipedia.org/wiki/Photoresistor

Thread 'Atmosphere on moons'

Why don't other large moons in our solar system have atmospheres like Titan?

View full post »

Thread 'Is space stretching or is new space being created?'

Do we even know? My understanding of dark energy is that particles come into existence, exert and outward force, then vanish. My problem with that is how, of course, then how does dark energy know to push everything in the same direction? The pressure exerted would be in all directions, even if the space was moving so why isn't stuff pushed all over the sky? Thanks - rev

View full post »

Thread 'The Physics of unloading sand from a barge'

I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...

View full post »