LDRs, Thermistors, And LEDs Flashcards
1
Q
How do LEDs work and why are they useful
A
They emit light when a current flows through them
They are used for digital clocks, traffic lights, and remote controls
They indicate the presence of current in a circuit
2
Q
How do LDRs work and why are they useful
A
They change their resistance depending on how much light falls on it
In bright light, the resistance falls
In dark light, the resistance is highest
They are used in burglar detectors
3
Q
How do thermistors work and why are they useful
A
Temperature-dependant resistor
In hot conditions, resistance drops
In cold conditions, resistance is highest
They are used in temperature sensors, thermostats, and fire alarms
