Which of the following devices is considered an active device?

An addressable tap is considered an active device because it contains components that can amplify or modify signals. Active devices require an external power source to operate and are capable of controlling the flow of electricity. In the context of telecommunications and broadcasting, an addressable tap can receive signals and then either amplify them or process them to allow for various functionalities, such as remote management or signal rerouting.

On the other hand, the passive splitter, coaxial cable, and resistor do not amplify signals and are not powered by an external source, which is why they are classified as passive devices. Passive devices alter the signals without adding power, simply directing or dividing the signals through their physical properties. Understanding these distinctions is vital for grasping how different components function within electronic systems.