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The function of an LDR or light dependent resistor is to change the brightness of the light based weather conditions or light hitting the object the LDR is on. When it is darker out, the light does not shine as brightly.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoA "Light Dependent Resistor" is a device which has a resistance which varies according to the amount of light falling on its surface . Standard LDR have a resistance in total darkness of 1 Mohm, and a resistance of a couple of kohm in bright light .
Function : The main purpose of a light dependent resistor is to change the brightness of a light in different weather conditions.This can easily be explained with the use of a watch. Some watches start to glow in the dark so that it is possible to see the time without having to press any buttons. It is the light dependent resistor that allows the watch to know when it has gotten dark, and change the emissions level of the light at that time. Traffic lights use this principle as well but their lights have to be brighter in the day time.
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Does electric current remain constant in a circuit?
No it depends on voltage and circuit resistance and other physical parameter which affect the properties of component used in circuitry like - temperature pressure humidity light(in light sensitive circuit- LDR photo diode,photo transistor,) and other.
How does light affect LDR?
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.
What is the function of a battery in an electric circuit?
To provide electricity for the bulb to light up.
Function of resistor capacitor and transistor on integrated circuit?
resistor
What are fractors?
A fractor is a circuit component that has both the function of resistor and capacitor.
What is the purpose of LDR on a circuit?
158980
What type of circuit normally contains LDR?
LDRs are normally found in Light/Dark sensing circuits
CAN LDRs be connected in parallel?
yes the ldr can be connected in a paralell circuit as i have done a experiment about te ldrs
What type of circuit normally contains a LDR?
LDRs are normally found in Light/Dark sensing circuits
What is the difference between LDR and LED?
An LED is an electircal component which converts electrical energy into light energy whereas an LDR uses light to complete the circuit and maintain the flow of current.
What is the principle of operation of LDR?
Working of light dependent resistor This circuit explains the principle of operation of LDR (light dependence resistor). The circuit has various applications like shadow alarm, automatic night/morning lamp. LDR, an acronym for light dependent resistor is a resistor whose resistance is dependent on light. The resistance of LDR is of the order of Mega Ohms in the absence of light and reduces to a few ohms in presence of light. In this circuit when the light falls on LDR, the resistance of LDR becomes low and the entire voltage drop takes place across the variable resistance VR1 (10K). As a result the base of transistor (T1) gets high input and it gets biased thereby glowing the LED. When no light falls on LDR, the resistance of LDR becomes high so almost entire voltage drop takes place across it and the base of transistor is at low potential. So transistor does not gets biased nor it becomes conducting, hence switching off the LED. The sensitivity of the circuit can be adjusted by varying the preset VR1. LDR, an acronym for light dependent resistor is a resistor whose resistance is dependent on light. The resistance of LDR is of the order of Mega Ohms in the absence of light and reduces to a few ohms in presence of light. In this circuit when the light falls on LDR, the resistance of LDR becomes low and the entire voltage drop takes place across the variable resistance VR1 (10K). As a result the base of transistor (T1) gets high input and it gets biased thereby glowing the LED. When no light falls on LDR, the resistance of LDR becomes high so almost entire voltage drop takes place across it and the base of transistor is at low potential. So transistor does not gets biased nor it becomes conducting, hence switching off the LED. The sensitivity of the circuit can be adjusted by varying the preset VR1.
What is the meaning of true differential TDR?
can you give me the information about True differential TDR? Ples.
What is the symbol for ldr?
this is the symbol for ldr
What is TDR?
In the cable tv industry a Tdr is a peice of equipment used to find faults in a variety of sizes of coaxial cable. TDR stands for Time Domain Reflectometer
What is TDR in irctc?
getting refund of money by ticket cancellation even after the chart is prepared by filing TDR
What is an LDR symbol?
An LDR is a Light dependent resistor.
What is the meaning of LDR?
LDR refers to Light Dependent Resistor.
