Understanding LDR, NTC, PTC, LED Diodes, and Semiconductor Crystals
Classified in Technology
Written on in English with a size of 2.85 KB
LDR (Light Dependent Resistor): These are resistors whose resistance value changes when illuminated by light (visible or invisible, such as ultraviolet or infrared).
LDR Features:
- Its resistance value depends on the amount of light that strikes it.
- Ohm's Law does not apply directly.
- Typically made from cadmium sulfide. This material, when kept in the dark, has very few free electrons, resulting in high resistance. However, when illuminated, it releases electrons, decreasing the resistance. This makes it a photoconductor.
- Manufacturers provide values such as resistance in total darkness (R), resistance under illumination (e.g., 1000 lux), permissible maximum stress, and maximum power.
- Can be used in lighting systems as detectors.
NTC (Negative Temperature
... Continue reading "Understanding LDR, NTC, PTC, LED Diodes, and Semiconductor Crystals" »