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Sensors and Transducers
Quick questions on LDR and thermistor input transducers explained: O-Level Electronics Sensors and Transducers
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the light-dependent resistor?Show answer
A light-dependent resistor senses light. Its resistance depends on how much light falls on it:
What is the thermistor?Show answer
A thermistor senses temperature. The common type used in the syllabus has a negative temperature coefficient, meaning:
What is producing a varying voltage?Show answer
A resistance change is not directly useful; circuits respond to voltage. Placing the transducer in a potential divider with a fixed resistor converts its changing resistance into a changing voltage, using:
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