Circuits

LDR: Resistor thats resistance depends on the light intesity, in bright light = resistance falls low. In darkness = the resistance is highest.

Used in outdoor lighting that's automatic.

Thermistor: Hot conditions = resistance drops low. cool temperatures = resistance goes up (higher).

Used in temperature detectors, e.g in a car engine.

Sensing Circuits: Used to increase power depending on the the conditions that they are in.

Used to operate a fan: as the enviroment gets hotter a Thermistors resistance descreases and takes a smaller share of potential difference from the power supply. So pd across the fixed resistor and the fan increases making the fan go faster.

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Series Circuits: Components are end to end between the + ve and - ve of the…