Light-Dependent Resistors (LDR) and Light-Emitting Diodes (LED) (Junior Cert Wood Technology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What is another name for a Light-Dependent Resistor (LDR)?
What is another name for a Light-Dependent Resistor (LDR)?
Photoresistor
What happens to an LDR's resistance when more light shines on it?
What happens to an LDR's resistance when more light shines on it?
Resistance decreases
In which two applications are LDRs commonly used?
In which two applications are LDRs commonly used?
Automatic street lights & night lights
How do LDRs enable automatic control in devices?
How do LDRs enable automatic control in devices?
By changing resistance based on light levels
What does an LED do when electricity goes through it?
What does an LED do when electricity goes through it?
Makes light
What is electroluminescence?
What is electroluminescence?
How LEDs make light with electricity
How do LEDs compare to old bulbs in terms of energy use?
How do LEDs compare to old bulbs in terms of energy use?
Use less energy
What is a key durability advantage of LEDs?
What is a key durability advantage of LEDs?
Last longer, reducing replacement cost
What design benefit does LED compactness provide?
What design benefit does LED compactness provide?
Good for different designs & flexibility
What is the purpose of combining LDRs with LEDs in a circuit?
What is the purpose of combining LDRs with LEDs in a circuit?
Automatically manage light changes