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Sensor Circuits

One of the resistors in a potential divider circuit could be a thermistor or LDR.The resistance of a thermistor changes with temperature and this changing resistance can be used to control an external circuit.The LDR resistance decreases with increased light intensity.This could be used to switch on a circuit when the sensor voltage reaches a certain level.

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Specification: Edexcel Physics (8PH0), AS-level, Topic 3: Electric Circuits, statements 43 and 44. Topic: Electrical Circuits.

Key terms in this lesson

potential divider
A circuit of resistors connected in series across a supply, used to produce a chosen fraction of the supply voltage as an output.

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