circuit devices Flashcards
what is LDR short for
light dependent resistor
what is a LDR resistor dependent on
intensity of light
what makes resistance fall
bright light
what happens to resistance in darkness
the resistance is highest
what are some applications LDR have
automatic night lights, outdoor lighting, burglar detectors
what is a thermistor
temperature dependent on resistor
when does the resistance drop
in hot conditions
when dies the resistance go up
in cool condition
what makes useful temp detectors
a thermistor
what is an example of thermistors (temp detectors)
car engine temp sensors
electronic thermostat
where can you use LDRs and Thermistors
in sensing circuits
what can sensing circuits be used for
turn or or increase the power to components depending on the conditions that they are in
what do fixed resistors and the fan always have
the same potential difference across them because they are connected in parallel
what happens to the thermistor as the room gets hotter
the resistance of the thermistor decreases
