Give an example of a typical output device used in automation.

In the context of automation, an electric motor serves as a typical output device because it is responsible for converting electrical energy into mechanical energy, thereby enabling the physical movement of machinery or equipment. Output devices are crucial in an automation system as they execute the commands issued by a control system, such as a PLC (Programmable Logic Controller).

When a PLC processes input data, it makes decisions based on pre-programmed logic to control actuators, which often include electric motors. For instance, in an industrial setting, an electric motor might be used to drive a conveyor belt, facilitating the automated movement of products along the production line. This action exemplifies the functionality of output devices since they bring about a tangible change in the physical world based on the automated control signals they receive.

In contrast, other options listed do not function as output devices. A temperature sensor is an input device that measures and reports temperature readings to the control system, while a PLC controller itself is the brain of the automation system that processes inputs and directs outputs. A power supply unit merely provides the necessary electrical energy to the system rather than executing commands or performing actions based on those commands.