LDRs and Thermistors.

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Presentation transcript:

LDRs and Thermistors

Light Dependent Resistor What is an LDR? Light Dependent Resistor What does this mean? The resistance of the component depends on the intensity of the light falling on it

What is the symbol for an LDR?

As the light intensity increases The resistance decreases

Which line represents the VI characteristics of an LDR in the dark? LDR in the light Low resistance LDR in the dark High resistance

A component whose resistance changes What is a thermistor? A component whose resistance changes as the temperature around it changes

What is the symbol for a thermistor?

For most thermistors the resistance decreases as the temperature increases This is not true for all thermistors though