What are the main differences between active and passive sensors? ◾ Passive sensors need an external power source to operate. Examples include strain gauges, thermistors, and RTDs (Resistance Temperature Detectors). ◾ Active sensors, however, generate their own power and don't need an external source. A common example is a thermocouple. Remember, while all sensors are transducers, not all transducers are sensors. Food for thought! What do you think? Share your thoughts in the comments! #sensors