7.4 LDRs and thermisotrs Flashcards
1
Q
What is a thermistor?
A
A type of resistor whose resistance depends on the temperature
The resistance decreases as the temp increases
2
Q
Give an example of where thermistors are used
A
Thermostats. The resistance in the termistor is measured so the surrounding temperature can be calculated.
3
Q
What is an LDR?
A
LDR = light-dependent resistor
Resistance depends on light intensity - resistance falls in brighter light
4
Q
When can an LDR be used?
A
When you only want a component to work in certain light levels (e.g. if you only want a light to switch on in the dark)
E.g. automatic street lights
