Internet of Things (IoT) Practice Exam

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What type of device is a water valve in an IoT system?

Sensor
Actuator
Control
Monitor

The correct answer is: Actuator

A water valve is classified as an actuator in an IoT system because it performs physical actions based on received commands. Actuators are devices that convert signals into movement or control mechanisms; in this case, a water valve opens or closes to regulate water flow based on inputs from sensors or control systems. This function is crucial in IoT applications where precise control of fluid dynamics is necessary, such as in smart irrigation systems or automated plumbing. While sensors detect environmental changes and provide data, a water valve actively changes its state in response to that data, demonstrating its role as an actuator. This distinction is essential in IoT systems, where actuators respond to the analysis of sensor data to automate processes effectively.