What are devices called that detect environmental changes?

Devices that detect environmental changes are known as sensors. Sensors are designed to respond to physical phenomena such as temperature, pressure, light, motion, and humidity. They convert these physical changes into signals that can be measured and interpreted, often turning real-world changes into data that can be used in various applications, from simple temperature readings to complex automation systems.

For instance, a temperature sensor detects fluctuations in temperature and outputs a signal that can be read by electronic systems, enabling the system to adjust heating or cooling as needed. This capability to provide feedback based on environmental conditions makes sensors crucial in a wide range of applications, from industrial automation to environmental monitoring.

The other options refer to related but different functions. Actuators are devices that take action based on signals typically sent by sensors, like opening a valve or moving a mechanical arm. Transducers convert one form of energy into another, like converting sound waves into electrical signals. Monitors usually refer to systems or devices that observe and display the status of something but may not necessarily detect environmental changes directly. In summary, sensors are specifically tailored for the detection of changes in the environment.