Biometrics is an example of which type of device?

Biometrics is an example of which type of device?

• A. Access control device
• B. Sensor
• C. Switching device
• D. Actuator

Answer: (C)

Biometric devices are described by the role they play in the access control system: they read biometric data and, when a match is found, they change the state of the system. That change is a switching action—taking the door from a locked state to an unlocked state. While the biometrics reader does sense information, the defining function in this context is to trigger a change in the circuit that controls access. It’s not the physical movement of the lock itself (that’s the actuator’s job), and it’s not the broader category of an access control system. So the best fit is a switching device, because its primary purpose is to switch the door’s access state in response to the verified input.

Biometric devices are described by the role they play in the access control system: they read biometric data and, when a match is found, they change the state of the system. That change is a switching action—taking the door from a locked state to an unlocked state. While the biometrics reader does sense information, the defining function in this context is to trigger a change in the circuit that controls access. It’s not the physical movement of the lock itself (that’s the actuator’s job), and it’s not the broader category of an access control system. So the best fit is a switching device, because its primary purpose is to switch the door’s access state in response to the verified input.