Material Conductivity: Material with Variable Ohmic Resistance

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.
sondreL
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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
 
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