Transducer
a device that converts a primary form of energy into a
corresponding signal with a different energy form
Primary Energy Forms: mechanical, thermal, electromagnetic,
optical, chemical, etc.
take form of a sensor or an actuator
Sensor (e.g., thermometer)
a device that detects/measures a signal or stimulus
acquires information from the “real world”
Actuator (e.g., heater)
a device that generates a signal or stimulus