Which statement best defines a transducer in sensor systems?

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Transducers in sensor systems are the devices that convert a physical property into an electrical signal, providing a way to translate real-world measurements into something the electronics can read. This is why they’re foundational for sensing: a temperature sensor changes its electrical output as temperature changes, a light sensor produces a signal proportional to light, and a microphone converts sound pressure into an electrical signal. Instrumentation amplifiers come after transduction to boost the resulting signal; they don’t create the measurement themselves. Inductors merely store energy in a magnetic field and don’t translate a physical quantity into an electrical output. Digital-to-analog conversion is about generating an analog signal from digital data, not the primary sensing action of turning a physical phenomenon into an electrical signal.