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10 Cards in this Set

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  • Back
What is an LDR?
An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits. It is a resistor.
LDR's change depending on what the conditions are, what are they?

1. In bright light, the resistance falls

2. In darkness, the resistance is highest

How are LDR'S useful?
The conditions makes it a useful device for various electronic circuits e.g. automatic night lights and burglar detectors
What does LDR stand for ?
Light Dependent Resistor
What is a thermistor?
An electrical resistor whose resistance is greatly reduced by heating, used for measurement and control.
Thermistors change depending on what the conditions are, what are they?

1. In hot conditions, the resistance drops

2. In cool conditions, the resistance goes up

What are thermistors good at?
They are useful temperature sensors e.g. car engine temperature gauges and electronic thermostats
Using a thermistor and a fixed resistor in a potential divider, what can you make?
A temperature sensor that gives a high voltage output when its hot and a low output when its cold.

What does a thermistor graph look like ?

What does a LDR graph look like ?