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Light Dependent Resistor (LDR) Quiz

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Questions and Answers

What happens to the resistance of a photoresistor with increasing light intensity?

It remains constant

It decreases (correct)

It increases

It fluctuates

What type of devices are LDRs in terms of their response to light intensity?

Linear

Digital

Analog

Non-linear (correct)

On what principle do LDRs operate?

Thermoelectricity

Electromagnetism

Photoconductivity (correct)

Piezoelectricity

What happens to the resistance of a photoresistor when there is a decrease in incident light intensity?

It increases Signup and view all the answers

What type of devices are LDRs in terms of their response to the wavelength of incident light?

Nonlinear devices Signup and view all the answers

What is the cause of the high resistance in a photoresistor when there is low light intensity?

High photoconductivity Signup and view all the answers

What is the main factor that determines the sensitivity of LDRs?

Semiconductor material used Signup and view all the answers

What does the function 'analogRead(sensorPin)' do in the provided code?

Reads the analog value from the specified pin and stores it in the variable sensorValue Signup and view all the answers

What is the purpose of the line 'if (analogRead(sensorValue))' in the provided code?

It checks if the analog value read from sensorValue is not zero Signup and view all the answers

What is the significance of 'Serial.println(sensorValue)' in the provided code?

It outputs the analog value of the sensor to the serial monitor for visualization and debugging Signup and view all the answers

Study Notes

Photoresistors (LDRs)

The resistance of a photoresistor decreases with increasing light intensity.
LDRs are inverse proportional devices, meaning their resistance decreases as light intensity increases.
LDRs operate on the principle of photoconductivity, where light absorption increases the number of charge carriers, reducing resistance.
When light intensity decreases, the resistance of a photoresistor increases.

Characteristics of LDRs

LDRs are selective devices, responding to a specific range of wavelengths.
The high resistance in a photoresistor in low light conditions is due to the limited number of charge carriers.
The main factor determining the sensitivity of LDRs is the material used.

Programming and Functions

The function 'analogRead(sensorPin)' reads the analog value from a sensor pin.
The line 'if (analogRead(sensorValue))' checks the value read from the sensor pin.
'Serial.println(sensorValue)' prints the sensor value to the serial monitor, allowing for debugging and monitoring.

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Description

Test your knowledge about light dependent resistors (LDRs) or photoresistors with this quiz. Learn about how their resistance changes with light intensity and their use as light sensors.