Arduino Photoresistor Tutorial Quiz

What is a common application of photoresistors in everyday devices?

• Measuring ambient light levels

• Measuring temperature

• Detecting motion

• Detecting sound levels

How does the resistance of a photoresistor change with light levels?

• Resistance increases with more light

• Resistance decreases with more light

• Resistance fluctuates randomly

• Resistance remains constant

Why can't an Arduino measure resistance directly?

• It can only measure temperature

• It can only measure voltage

• It can only measure current

• It can only measure light

What is the purpose of a voltage divider in the circuit?

• To decrease the voltage

• To allow measurement of voltage changes

• To increase the current

• To stabilize the resistance

In the Arduino code, what is the role of the 'threshold' variable?

• To adjust the light intensity

• To determine when to turn the LED on or off

• To set the maximum voltage

• To measure the current

What command is used to read the sensor value in the Arduino code?

• analogWrite

• analogRead

• digitalWrite

• digitalRead

How can you adjust the sensitivity of the light sensor in the circuit?

• By adjusting the resistor value

• By changing the LED color

• By changing the Arduino model

• By using a different power source

What happens when you increase the resistor value in the circuit?

• The voltage decreases

• The sensor becomes less sensitive

• The voltage increases

• The sensor becomes more sensitive

What is one potential application of the light sensor beyond simple on/off behavior?

• Measuring temperature

• Controlling the speed of a motor

• Detecting sound

• Measuring humidity

What is the effect of changing the threshold value in the Arduino code?

• It changes the LED color

• It adjusts when the LED turns on or off

• It changes the power supply

• It alters the sensor's physical size