Since it's about dating, it means long distance relationships. According to my knowledge, it's originiated from an article at millionairecupid.com, which talks about the relationship between a rich man and a beautiful woman who located in difference countries. The it becomes popular.
Those are resistors whose resistance changes with light falling on it.
this is the symbol for ldr
Basically, ETC
Measure Light Intensity using Light Dependent Resistor (LDR) The resistance of the Light Dependent Resistor (LDR) varies according to the amount of light that falls on it. The relationship between the resistance RL and light intensity Lux for a typical LDR is RL = 500 / Lux Kohm With the LDR connected to 5V through a 3.3K resistor, the output voltage of the LDR is Vo = 5*RL / (RL+3.3) Reworking the equation, we obtain the light intensity Lux = (2500/Vo - 500)/3.3 For a low cost LDR, at the same light intensity, the part to part variation in resistance can be as high as 50%. Therefore such a low cost LDR is seldom used for measuring light intensity but more for light presence/absence detection.
The resistance of LDR increases when light is not available (or is limited). And the resistance drops when Light is abundant.This principle can be used in proximity detectors where one or more light source(s) is/are active. When a person / object comes in proximity of the source, the light gets reflected from the object-surface & can now be received by LDR. So due to proximity of the object, resistance of LDR changes - this can be used to trigger different actions like open the door, trigger a motor. Fire an alarm. etc.Resistance of LDR varies according to intensity of incident light over it,It is used in street light to detect day/night and turn on/off the street light automatically
Light dependent resistor.
automatic
industrial automaton
this is the symbol for ldr
An LDR is a Light dependent resistor.
Basically, ETC
LDR refers to Light Dependent Resistor.
An LDR is a light dependent resistor, which is usually used to detect light levels, either ambient or reflected. The LDR works because incoming light carries energy, which can elevate the energy levels of electrons in a suitable medium to join the 'conduction band' which means that there are more charge carriers in the LDR, and hence the cell has lower resistance.
Light Dependent Resistor LDR also means long distance relationship.
The symbol for LDR Holding Corporation in NASDAQ is: LDRH.
Cadmium Sulphide (CdS), Cadmium Selenide (CdSe), Selenium, etc.
LDR Holding Corporation (LDRH) had its IPO in 2013.
When LDR is exposed to light energy . Due to light energy incident on LDR surface, free electron movement of an atom is increased in LDR. This causes high conduction of curent flowing through LDR. beause of free electron movement in LDR, resitance get decreased.